Trailer width is important. Allowable down the road is 8 1/2' maximum outside dimension. You will encounter serious problems with narrower trailers. I would not give up one foot of the 20' bed length of my trailer. In my world, the beaver tail is out. They are too low in the rear and are a drag hazard. I opt for longer ramps and max length flat useable bed. 7000 lbs GVW would do the job but with no margin. The trailers I have seen with this rating normally have 3.5K axles and 10 X 2 1/4 brakes. The 5K axles can have 12 X 2 brakes which are much better. Hydraulic surge brakes are normally available and negate the electric requirements of electric trailer brakes. Either type will work and each has it's deficiencies. Suggest Teconsha Voyager as controller for electric brakes. Tandem axle trailers come with two different types of suspension. The torsion axle setup is normally considered to be the premium combination. Leaf springs and equalizer links are the other type. Be very mindful that the torsion axle design is very much dependant on the trailer towing level as there is no load transfer equalization built in as there is with the leaf setup. If a trailer stays with one tow vehicle and it is set up properly the torsion axles are fine. Shocks are nice. This type of trailer and load needs a stout tow vehicle. Minimum equipment should be an 8K GVW rated pickup and a load distributing hitch. I use the Reese product with cam locking sway control and that setup is stable. Hitch ball should be 2 5/16" dia. for anything over 5K GVW. I tarp my 8K Warn electric winch (which single line has loaded everything I have needed to load). It is removable (2" square receiver hitch). There are aluminum boxes available built to mount on the trailer tongue and house a winch and tie down straps and all; really neat. Northern Tool and Equipment is a source. HTH Warren Anderson Sedona,AZ