I agree with Mafesto on one thing, you definately get what you pay for so go higher end if you can. I learned the hard way. Last year I bought a 2015 Ameripro 7x29 with all the options they offered and after the first trip, the floor started to warp. This happened even though I paid for the "upgraded HD water/warp resistent floor" and custom ordered 12" on center floor braces. Also every screw was over torqued and I kept finding screw heads all over broke off. Dealer was no help and I went straight to the manufacturer who I fought with for over 4 months to get it fixed. As soon as it was fixed I sold it.
I now own a brand new Aluma 8.5x24+4v lowboy car hauler, twice the price, but 10x the trailer and worth every penny. I 100% agree with Dukhtr3, I will never go back to a 7'. This trailer while being heavier pulls so much better, doesn't sway, and while being a foot shorter total, has tons more room inside. Definatley the 8.5' lowboy car hauler is the way to go.
Having the sleds side by side is extremely easy to get around, I would typically cram 4-5 long track sleds into the 7' and what a pain to get around and tie down..
Only downside is its tougher to see around even with my Ram moose mirrors out. haha
Here are some photos of mine. It is a 2016 Aluma 8.5' x 24' with a 4' v-front. 100% all aluminum, no wood. Aluminum floor and ramps. 5200# axles. I put low pro grip glides on the ramps. (worth the money- there amazing) On the floor I put .75" 4x6 stall mats. The sleds slide right over them even with brand new carbides and still have the ability to steer. I will be adding fuel doors, benches, LED interior lighting, and racks, I could've had the dealer done them but he had this one on the lot and I didn't want to wait for one to be built.