I would assume that you are looking at a "V" front with ramp? I just went thru all of this. I went with an 8' wide to get 4 sleds in comfortably. You could do it with a 7' wide but it is very tight, and leaves you no room to work around the sleds as far as fueling. I also went with a shorty, I feel like keeping the profile of the trailer as close to the top of the tow vehicle is a huge advantage. There is some weight savings as well. I know others will probably prefer a true 7' side wall. I borrowed, and demo pulled several types of trailers before I made my decission. Dealers are very willing to assist you in any way they can rite now, and if you think about it, you don't buy a car without test driving it. Why should a trailer be any different. I am finishing mine off myself so that I could set it up the way I want it. Electrical where I want, A.C. down the road, lots of lighting inside, ramp lights outside, and of course the necessities. CD stereo, satelite radio, flat screen TV with built in DVD player. I also cut in a window for ventilation. I am concerned a little about condensation with added heat.
One thing to consider and I missed it completely, is what side you want your walk in door on, and if you want it on the same side as your front ramp door. Mine is on the opposite side from my ramp door and I am not yet sure how I feel about it.
Just my 2 cents worth.