Following are some helpful tips for towing 4 wheels down:
Before attempting to tow anything, it's important to know your motorhome's gross combination weight rating (gcwr) and its capacity for towing unbraked loads.
A good rule of thumb is you need a minimum of 10 horsepower for each 1000 pounds of weight you are carrying.
Before moving the towed vehicle, check the following: transmission fluid level is full, release the parking brake, start the engine, shift the transmission from Park to Drive, shift from Drive to Neutral, turn off the engine, leave the key in the Accessory (I) position, make sure the radio and all accessories are turned off.
The steering system can be damaged if the steering wheel is locked. Always leave the key in the Accessory (I) Position to prevent damage to the steering system when towing behind another vehicle.
Some recommend starting the engine and shifting the automatic transmission (if so equipped) through the gears approximately every 500 miles and shifting from Drive to Neutral before shutting off the engine.
Safe towing of a vehicle with four wheels on the ground behind a motorhome can only be done with a supplemental braking system including a break-away feature.
SEVERE AUTOMATIC TRANSMISSION DAMAGE WILL OCCUR IF THE CAR IS SHIFTED FROM REVERSE TO NEUTRAL AND THEN TOWED WITH THE DRIVE WHEELS ON THE GROUND.
You can avoid certain kinds of handling problems by making sure that your vehicle is towed with the tow bar as close to horizontal (parallel to the ground) as possible. This prevents your vehicle from "riding up" or "running under" the back of your coach during hard stops. It also avoids excessive stress on both the hitch receiver and your vehicle's mounting brackets.
Most newer vehicles will not add miles to the odometer while they are being towed. Such vehicles have an electronic odometer which will work only if the key is in the "on" position. If your vehicle is an older model and does not have an electronic odometer, you will need to have a Speedometer Disconnect to keep miles from adding up on your towed vehicle.
Never ever back up with a vehicle attached to your coach with a tow bar. Backing up is the most common way of damaging your tow bar or towed vehicle.