yeah on that....servo trailers are almost always death traps. while you might use one to move something around town if you needed to, taking one on a long drive is likely to end in tears.
they are heavy, often have bent axles/bad alignment, cheap tyres, unmaintained hubs etc etc. I have seen some that are brand new which would probably be OK if you are lucky to get in before some other mug bends it, but most of them are terrible.