MDC OFF-GRID extreme XT12HR

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OWNERS MANUAL

2025

XT12HR OFFROAD TRAVEL TRAILER

OFF-GRID EXTREME EDITION

IN ASSOCIATION WITH

Main Page

General Information2
Servicing Guidelines2
User Responsibilities2
Table of Contents4
General Safety Information7
Safety Alert Symbols and Signal Words7
Reporting Safety Defects7
Essential Safety & Operational Guidelines7
Modifications to the Product8
Propane Systems8
Chassis8
Fire Safety9
Ventilation9
Precautions9
Combustible Materials9
Fire Extinguisher & Emergency Procedures9
In Case of Fire9
Secondary Escape9
Button/Coin Battery10
Tire Safety & Maintenance11
Determining Correct Load Limit11
Trailers 10,000 Pounds GVWR or Less11
Steps for Determining Load Limit - TOW VEHICLE11
Tire Safety - Everything Rides on It11
Checking & Maintaining Proper Tire Pressure12
Your Vehicles Recommended Pressure and Load Limit12
Understanding Tire Pressure and Load Limits12
Checking Tire Pressure12
Steps for Maintaining Proper Tire Pressure12
Tire Size13
Tire Tread13
Tire Balance and Wheel Alignment13
Tire Repair13
Tire Fundamentals13
Understanding Tire Sizes & Treadware Ratings14
Information on Passenger Vehicle Tires14
Additional Information on Light Truck Tires15
Tire Safety Tips15
General Trailer Care and Maintenance16
Protection of Finishes16
Paint16
Acrylic Windows16
Internal Finishes16
Granite Sink Finish16
Bathroom Finishes16
Mirrors16
Galvanised Finishes16
High Tensile Bolt and Fittings16
Shade and Screen Care17
Corrosion Protection17
Roof Maintenance17
Sealants17
Solar Panels17
Service Ladder17
Trailer Body Maintenance17
Locks and Latches17
Rubber Seals17
Dimensions18
Towing & Load Management19
Terminology & Abbreviations19
Achieving a Safe Towing Combination20
Trailer & Tow Vehilce Tire Pressures20
Trailer Tire Pressures20
Tow Vehicle Tire Pressures20
Load Placement21
Tongue (Coupler) Weight21
Trailer Levelling21
Hitch Movement21
Vehicle Squat21
Maximum Weight Limits22
Trailer GVWR (Gross Vehicle Weight Rating)22
Towing Vehicle GVWR (Gross Vehicle Weight Rating)22
GCWR (Gross Combined Weighed Rating)22
GAWR (Gross Axle Weight Rating)23
Summary of Weight Ratings23
Towing Mirrors23
Tuson Electronic Stability Control System (TSC-1000)24
Troubleshooting the TSC-100025
Vehicle Electrical Requirements26
Brake Controller26
Trailer Connector and Emergency Breakaway Power Supply2526
Trailer Lights26
Charging RV While Driving26
Understanding Alternator Types27
Why Alternator Type Matters27
Checking Your Alternator Type27
Vehicles with or Without Smart Alternators28
Towing Your Travel Trailer29
Weights and Payload Capacities29
How to Load Your Trailer29
Load Distribution Guide29
Tongue Weight29
Effects of Weight Distribution29
Tire Pressures30
Towing with Trucks30
How to Hitch Your Coupler31
Preparation31
Coupling32
Uncoupling33
Emergency Breakaway System34
Connecting the Breakaway34
Safety Attachment Chains and Load Sling Tags34
Connecting the Safety Chains35
Connecting the Electrics35
Braking Systems36
Hand Brake36
Adjuster Automotive Type36
Correct Use of Your Electric Brakes37
Brake Adjustment37
Brake Cleaning and Inspection37
Brake Lubrication37
Brake Magnets37
Shoes and Linings38
Corrosion Prevention38
Wheels and Tires38
Highway38
Offroad38
Suspension38
Shock Absorbers & Bushes38
Wireless Rear-View Camera39
Troubleshooting the Rear-View Camera39
Charging the Caravan40
Grid Power40
Solar (PV) Power40
Towing Vehicle Charging40
Travelling During Winter41
Truma Aquago Electric Antifreeze Kit41
Starting up the Eelctric Antifreeze Kit41
Switching to LP Gas Mode42
Water Tank Heating Pads42
Renogy Battery Smart Self-Heating42
Truma Varioheat42
Trailer Set up & Operation43
Setting up the Trailer43
Finding a Suitable Spot43
Weather43
Using Wheel Chocks and Ramps43
Operating the Jockey Wheel43
Stabiliser Legs43
Electric Cassette Awning44
External Kitchen44
Preparing for Bad Weather44
Electrical Systems & Safety45
General Electrical Safety45
Using Power Leads45
GFI Safety Switch45
Low Voltage (110-120Vac) Power System46
Mains/Shore Power46
RV Power Pedestal Services46
Connecting to 30A Service46
Charging at Home46
Using 50A or 20A Service with a 30A RV46
120VAC Overload Protection47
Main Circuit Breaker & Shore Power Protection47
Inverter Power Protection47
Branch Circuit Breakers47
GFCI (Ground Fault Circuit Interrupter) Protection47
Automatic AC Power Transfer48
Extra Low Voltage (12Vdc) Power System49
Distribution Switchboard Control Panel49
12V Isolator Switch49
LED Rocker Switches49
Mini Circuit Breakers49
Renogy ONE Core49
12VDC Overload Protection50
High Load Primary ANL Fuses50
Medium Load Secondary Circuit Breakers (10A-50A)50
Mini Circuit Breakers50
Single-Use Blade Fuses (1A-30A)51
PV (Solar) Single-Use Ceramic Fuses (10-15A)51
Lithium Battery System52
Battery Safety & Handling52
System Overview52
System Components & Wiring Configuration52
Battery Activation & Initial Use53
Turning the Battery on for Use53
Checking Battery Status54
Checking the Heater Status54
Changing Battery Heater Settings55
Storage & Maintenance56
Turning off the Battery for Long-Term Storage56
Battery Maintenance57
Cleaning the Battery57
Battery System Troubleshooting & Common Issues58
Charging the Battery System59
Low Voltage (110-120Vac) Charging59
Preparing the Trailer for AC Charging59
REGO Inverter-Charger LED Indicators59
Extra Low Voltage (12Vdc) Charging60
DC-DC Charging from a Towing Vehicle and Solar (PV) System61
DC-DC Charger LED Indicators61
Auxiliary Solar Panel Inputs (Offside Anderson Plugs)62
Auxiliary Solar Input Limitations62
Best Practices for Using Auxiliary Solar Inputs62
Understanding MPPT Charging and Solar Performance63
How MPPT Charging Works63
The Power Curve and MPPT Tracking63
Managing Expectations for Solar Performance63
Inverter Functions of the Renogy REGO 3000W Inverter65
Basic Operation65
Configuration Panel Overview66
Factory Default Settings (DO NOT CHANGE)66
User-Adjustable Settings66
Changing AC Output Priority Mode66
Use of Appliances67
General Appliance Use67
Safety Warnings68
110-120V Ac Shock Hazard68
Battery & DC Safety68
Safe Use of Appliances68
Maximizing Battery Use69
Charging While Towing69
Refrigerator Optimization69
Efficient Use of Electrical Accessories69
Lighting Efficiency69
Heating Considerations69
Solar Panel Maintenance69
Generator Usage69
Renogy ONE Core Energy Monitoring System70
Powering On/Off70
System Display & Monitoring70
Pairing with the Renogy DC Home App71
Managing Renogy Devices71
Smart Scenes & Automation72
Troubleshooting Guide72
Maintenance & Best Practices72
Factory Default Settings (DO NOT CHANGE)72
TV Antenna73
Truma Aventa Eco Air Conditioner System74
Safety Information74
Operating the Truma Aventa Eco74
Powering on the System74
Operation Via Truma CP Plus Control Panel74
Operation Via Remote Control75
Maintenance & Cleaning75
Propane & Water Systems76
Propane & Appliance Safety76
Propane Certification76
General Propane Safety76
Gas Cylinder Safety76
Propane Appliance Safety76
Ventilation and Flues76
Isolating Appliances77
Truma Vario Heat Propane Air Heater Safety77
Important Information before Operating the Heater77
Safe Operating Practices77
Risks of Injury and Burns77
Water System Overview78
Wet Bay79
Fresh Water Tanks79
Water Pump Operation79
Selecting the Fresh Water Tank80
City Water Inlet80
Grey Water Tank80
Truma Aquago Comfort Plus Hot Water System81
Preparation and Initial Setup81
Propane Supply81
Water Supply81
Power on81
Operation Modes with Truma CP Plus82
ECO Mode82
COMFORT Mode82
OFF Mode82
Using the Hot Water83
Safety Tips During Use83
Shutting down the System83
Maintenance and Cleaning83
Draining the System83
Cleaning the Water Filter84
Cleaning the External Vent84
Decalcification84
Annual Maintenance84
Winterization and Cold Weather Usage84
Truma Aqua Go Troubleshooting85
Cassette Toilet Operation86
Bathroom Care and Maintenance86
Toilet Maintenance87
Protecting from Mold87
Connecting the Propane88
To Set up Your Propane System88
Important Safety Measures88
Propane Furnace89
Truma Varioheat89
Safety Information89
Operation and Maintenance89
Operating the Truma Varioheat89
Preparing the Unit89
Starting the Furnace89
Shutting down the Furnace89
Maintenance90
Packing down & Storage91
Packing down Your Travel Trailer91
Long Term Storage91
Interior91
Exterior91
Battery91
Security91
Winterizing Your Trailer92
Prepare the Trailer for Winterizarion92
Drain the Water System92
Bypass the Water Heater92
Introduce RV Antifreeze into the Plumbing System93
Final System Check93
Winterizing Notes93
General Troubleshooting94
110-120 Volt Electrical System94
Water System96
Propane System96
Brakes96
Mechanical & Structural Maintenance98
Hitch98
Ball Bearing Slides98
Wheels and Tires98
Brakes98
Bearings and Seals98
Suspension99
Shock Absorbers & Bushes99
Wheel Alignment99
Jacking Your Trailer99
Torque Settings for Components100
Wheel Lug Nuts100
Hitch100
Trailing Arm Pivot Bolts100
Spare Part Numbers101
Hub Assembly102
Trailing Arm Bushes103
Service Schedule104
Warranty Policy & Coverage126
Limitation of Liability129
Appendicies130
Recommended Accessories130
Essential Recovery Equipment131
Wiring Diagrams133
AC + DC Main Circuit133
Distribution Switchboard Control Panel134
Pre-Trip Inspection Checklist135
Fire Extinguisher135
Travel Record136

Brand	MDC
Model	OFF-GRID extreme XT12HR
Category	Caravans
Language	English

MDC OFF-GRID extreme XT12HR - User Manual

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