I bought a 12' utility trailer from AllPro a couple of years ago, and it was pretty good, but I had a problem with the wiring, which they claimed was my truck's fault. It wasn't. It was the wiring harness being chafed in the holes through which they ran causing a short. Once I traced the short and repaired the wire, and placed anti chafing tape where the wires ran through the frame it worked fine. I used the trailer for 4 years hauling my 4 wheeler and various ag equipment to my hunting club, and didn't get any rust except in areas where the paint had chipped off.
I've not used one of the larger tilt type trailers about which you're speaking, but as far as AllPro's quality, I'd say it was fair to good. You might want to check out Crosley down in Starke. They no longer make their own, but are dealers for Anderson and the quality seems very good. I'm looking to get a 20'-24' gooseneck to transport my tractor (once I decide which one to buy) and Jeep, and they seem very competitive with AllPro.