I've been asked to design a trolley with swivel wheels and that can be towed by a fork-lift truck, so preferably with a front axle. Where can I find information about the best material and joints for the job?
Sounds similar to the trolleys they use in the military to move munitions around airfields/aircraft carriers. Have you tried manufacturers of those to save time?
If you're in the UK, I believe Douglas TugMaster manufactur some...