I'm looking to get a 16x7 or larger enclosed trailer to make moving easier. 16x7 should hold my Corvair, and 2 or 3 sleds later on.
any pointers for buying?
Figure out the weight you will carry. And the size of the items. Sounds like you know the size(car, sleds) already. get the weights on those, and remember, a 7000lb capacity enclosed trailer weighs 2000lbs+, so you will have a cargo capacity of 5000lbs or less.
any "must have" features?
-Brakes on both axles
-Brake controller on the tow vehicle
-Interior lights
-backup lights are nice
-Lots of tiedowns rated for the weight you'll be tying off. You can NEVER have too many...
-A SPARE tire. I see trailers on the side of the road, with a tire off. I don't want to leave my trailer
-lug wrench, trailer lugs will probably be different than the tow vehicle
-A well matched hitch. I have three drop hitches, one to match the ball height for each of the three trailers I tow.
Why do they use dual axles when a stronger single axle would seam to be cheaper and lighter
A dual axle trailer tows nicer and backs easier. The weight is distributed better on the tires/axles. Two axles have brakes
I specced and bought the trailer for our Buy Scouts. Pace 14x7 enclosed, dual axle. We have a big Troop. We could have fit in a smaller trailer, but our gear, cook boxes, dutch ovens ect pushed the weight past what a single axle would do.
I just towed for a campout this last weekend. That Pace tows really nice, stops nice, and handles great.