Oh totally.
I think my friend and I have rebuilt and re-designed the bike trailer 3 times now. The last time it was a broken wheel mount. 2 screws just couldn't handle the side loads of curbs...that was an obvious screwup that we somehow missed, the other wheel has 3 times the screws. Parts were all free, so we didn't see a need to engineer it for all situations, we just adjust it when the situation arises. And the last adjustment is so we can hook it up to the motor-bike instead of my road bike. We already made a concept mock up (I side on the trailer and put my hands on the bike stem to keep the front tire outa the trailer).
But if you know your needs and situations, and can design/build for it, don't skimp. Do it right. otherwise...
Eh. I think poorly built things are fun, especially when your trailer comes unhitched in traffic and you can't stop laughing because it made an illegal turn (it was funny, and the risk was low).
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