Hi, In your post you didn't mention what the trailer woud be used for? I'll assume you want a quality trailer and plan on keeping it for awhile, I know some people just buy one to move something, sell when job is done, they are not in the market for quality, just need a task done. I have bought and sold several trailer, you do get what you pay for, and quality trailers hold there value. I currently have a HALLMARK, the modle I have is a EDGE-36' gooseneck tri-axle, I know this is not what you are look at, but I did chose HALLMARK based on there quality, reputation, and option offered. For the size you are looking at I would consider the following
1. floor - shopuld be 3/4", treated if possible.
2. Under floor spacing of supports 16" oc
3. Side wall supports 16" oc
4. Get a side door, you will kick yuorself later if not
5. Toursion axles are the only way to go, 95% are like that
leaf springs are a thing of the past, lower center of gravity
and much less sway. Also less maintanence, better ride.
6. Axles should be DEXTER, watch, cheap trailers have been using
seconds for there axles. Most time look at the center of the
shaft where the grease fiting is, alot of seconds(rejects by most good companies) have the grease fitting hole drilled off center.
7. Look for name brand tires, GOODYEAR best new tire out.
8. Look under trailer and check out the welds, meany trailers are made with prison or questionable (mexican) labor.
Hope this helps, also before you give anyone your hard earned money, take the trailer for a test drive. Make shure you do stop and go traffic, and highway. You want to make shure the trailer track nice and streight, if it does the ole tail wag, move on to something else.