Some things to look for in a trailer, just suggestions
1. welds and how the trailer is made, type of steel, I prefer I channel better than angle iron, grab the front of a trailer, push down on a corner, if you can flex the other corner in the rear, it is a weak angle iron trailer
2. electrical, how is the wiring done, exposed, sealed in, quality of lights,ect
3. Floor, how close are crossmembers, I like 12" on centers, makes for a strong trailer, take no less than 16"
4. suspension, a dexter axle and torflex suspension is worth the extra cash, it needs no maintenance and will last the life of the trailer, not to mention ride great, unlike springs
that wear out
5. coupler, get at least a 2" ball, one with a heavy duty clasp that you just pull back on is easier to operate(ie doesnt get stuck as easy), plus if the pin goes in, you know its closed all the way, no guessing
6. good paint, I hate cheap paint