I've been right where you are...3 times.
1st time I pulled my boat out of Cowan and my trailer broke in half. Lucky for me Tommy had a little buzz box welder and some rods I could use. You haven't live until you've welder wet, rusty, painted metal back together in shorts, sandals and a tee shirt on a 95 degree day.
2nd time I pulled my boat out of EF and my trailer folded in 2. Both center cross members rusted and snapped. Got lucky again. 2 guys who work for me lived near by. They came drove over, picked up my trailer and knew a guy who had 1 welding rod. One of the guys who worked for me was a welder and he patched it up enough to get my boat out to work where I could replace the cross members.
The 3rd time it was the same trailer as the 2nd time this time I noticed some rusty spots in both rails. I took the rig to work and pulled the boat off looked at the trailer and decided I needed a new trailer. Unfortunately it's not easy finding one so I had to do a lot of patching to make the trailer safe for an upcoming trip to Ky Lake.
Here's the problem with trailers
A lot of cheap trailers are made from tube steel. When a trailer is painted, it's just the outside that get's the paint and the inside is just plain steel and it's prone to rusting. Tube steel is similar to pipe in the fact that it rusts form the inside out. It's rare to see the problem before something breaks. You are correct CJP...everyone should inspect their trailers.
Here the next problem.
No one wants to sell you just a trailer at a REASONABLE price. The place where I bought the boat refused to even give me a price because he didn't want to waste his time getting a price because he said it was too expensive and I wouldn't buy it so why bother. I never could figure out how he knew what my budget was. I called BPS because it's a Tracker and the said they would only sell complete out fits. I called a few other places and their prices we just ridiculous. Finally I called Allcraft Marine (513-533-8800) and he found me a galvanized trailer for half the price of what other people quoted me on painted trailers. It's an EZ Loader Trailer and they have lots of sizes. If ya can't find what ya need up there give Allcraft a call.