Can you tow a 20 foot enclosed trailer with a V6 motor?

Answer 1

Engine, not motor.

The length isn't the concern so much as the tongue weight of the trailer vs. what your vehicle is rated for, and the weight of the trailer vs. the towing capacity of your vehicle. Your gear ratios come into play, as well. And the number of cylinders isn't so relevant as the performance of the engine... tractor-trailers have a six cylinder engine, but those are diesel engines displacing anywhere between 11 and 16 liters.

As for car engines, the engine itself comes into play. When you say V6, you could be talking about anything from the 3.0 Ford V6 used in the Ranger, Bronco II, and other Ford vehicles all the way up to the 4.3 Vortec V6. I have a 4.3 Vortec, personally, but this one has been upgraded with new injectors, cold air intake, new exhaust, and a turbo - mine can hang with a small block V8. Stock from the factory, it couldn't.

Without more details pertaining to the weight of the trailer, the engine you're using, and the vehicle you're using (whether that V6 is pushing a 1/4 ton or 1/2 ton pickup is going to be significant), it's difficult to say what the results will be in your case. Hook it to the trailer hitch. If you end up with your front end sticking up and your rear end sticking way down, you have too much weight on the tongue. This is extremely dangerous, and can very easily cause the vehicle to go out of control. You also have to assess how much weight you're pulling and what type of terrain you're in. If you're driving through the Rockies, and you're at the absolute max of that vehicle's towing capacity, you're not going to be faring so well. If you're on flat land, you can manage.