I think that they are pretty good. I have a homemade tri-axle tag we used to pull all over the place and we never had any problems. There is definitely one drawback, we could never seem to get the brakes to work very well. We rebuilt them and had a new controller but still didn't have much luck. The guy that owned the trailer I mentioned said he couldn't get the brakes to lock up but that they did slow his truck down noticably. I had a factory totem-all bobcat trailer with dayton style axles, I asked our local trailer dealer/repair shop about them, he said that up untill the 80's that mobile homes used regular trailer axles, then they started using cheap axles due to cost. He said old house trailer axles are just as good as regular trailer axles but steer away from newer ones. The rims were the same so it was a piece of cake to find spares, I have yet to find a spare rim for my gooseneck which has 8 lug rims. As for as changing tires theres not much difference, they just don't look modern.
It would be great to find a trailer down there that I could go through while waiting to move my family down in June after the kids get out of school.