[David Pozzi]

My 22' all-Aluminum Featherlight trailer with a 3500 lb Camaro, pretty good set of tools and tool box, small generator, winch, portable awning, and some assorted pit equipment weighs 8500 lbs.

My wifes 28' steel Haulmark with tools, 2nd gen Camaro, gen, & pit equipment, & spare set of tires, weighs 10,500 lbs!

It's very easy to overload a 7000 lb trailer. Next step is a 9500 lb rating which allows you to tow without a special license.

I think a 22' box is minimum if you have a tool box or cabinets up front, a 24' is ideal, a 26' to 28' is lavish. For car-only, a 20' box works, but it depends on what kind of car you are hauling. You need just under 16' for a Camaro and then a couple of extra feet per end to have enough room for the tie down straps. A larger car needs more room. We hauled a Nextel Cup car in Mary's trailer that took a lot more room.

At 70 with Cummins Diesel, we get 12.6mpg, at 60mph, we get 14.5mpg, so slow down and save on fuel! In California, the speed limit for towing or trucks is 55. I've pulled V nose horse trailers with a pickup and really noticed the lower drag approaching stop signs, I had to hit the brakes hard to get slowed down! Normal trailers were like pulling a parachute, I'd just lift off the throttle to slow down. If you want to go 70 a lot, then look at the V nose trailers, the slower you go, the less benefit to the V nose.
David