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Some cars come from the manufacturer with the ability to be readily towed four down. Simply add the appropriate hitching materials (face plate and tow bar), some electrical connections, maybe an auxiliary braking system, and you're good to go. But not all vehicles are so easily towed. There are plenty of cars out there whose automatic transmissions simply aren't approved for four-down use. Enter aftermarket equipment that can modify the vehicle.
Drive shaft coupling systems: If your choice of a toad car is rear-wheel drive with an automatic, this system simply uncouples the transmission from the drive shaft, making four-down towing possible. What's required is having the car's original drive-shaft removed and reworked, then reinstalled with a special clutch system. With this system, your toad's odometer doesn't rack up miles while under tow.
One thing to keep in mind – when it comes time to change toad cars, you won't likely be able to take the system away and install it on your new car – it's specific to make and model.
Transmission fluid pump: If you've a front-wheel drive car (and a very few rear wheel drive), this system will typically work for you. Why do you need it? With four-wheels down and turning, the automatic transmission is engaged and requires lubrication. Most front-wheel-drive cars come from the factory with a lubrication system that requires the car's engine to be running to get the required lube flow. This after-market system adds a lubrication pump, typically powered by the motorhome.
What to look for? Some manufacturer's provide a warranty that covers, not only their product, but also covers damage to your towed car if the system should fail. Not all do, and unless you have a lot of faith (and a lot of money) we'd look elsewhere. Some systems include an electronic monitoring system that mounts up in the motorhome cockpit that warns if the system has failed.
Unlike the drive shaft coupling system, you can generally take the transmission lube pump system with you and install it on your next toad car with little (if any) extra expense.
Axle-lock systems: Only for front-wheel-drive automatics, this system is placed on the car's axle shaft (half-shaft). Turn the axle-lock "in or out" for towing. This one is specific to your toad car, so once again, you won't be taking this setup with you to the new toad.
Regardless of which of style of units interest you, be sure to check with a sales rep or manufacturer to talk about your toad car specifics.