dingy towing 1500 Ram behind R.V. with tow bar. all wheels on the ground

You do not mention if your vehicle is a 4X4 or a 4X2 wheel drive. FOUR-WHEEL-DRIVE VEHICLE TOWING: DaimlerChrysler Corporation recommends that a vehicle be transported on a flat-bed device. A Wheel-lift or Sling-type device can be used provided all the wheels are lifted off the ground using tow dollies. A prerequisite for safe towing is use of a proper combination of vehicles. A variety of compact cars, sport-utility vehicles and trucks, including those with front-wheel drive and power steering, are approved by their manufacturers for towing over long distances without speed restrictions. In order to determine whether a vehicle is suitable to be towed behind a motorhome, check the owner's manuals of the models you are considering; this is the only way to be sure the vehicle can be towed without drive-train modifications. The owner's manual will have specific written instructions on how to tow behind a motorhome, if it is approved. Most vehicles that are not approved by their manufacturers for towing on all four wheels can still be towed using aftermarket accessories such as a cable-operated driveshaft-disconnect device (rear-wheel-drive vehicles only), a driveshaft-disconnect device, or free-wheeling hubs (front-wheel drive), a dolly, or a trailer.