Wheels for Your Wagon: The choices in trailer axles

It's probably good that buyers are not usually directly involved in spec'ing trailer axles and suspensions. They make recommendations and requests, sure, but the heavy lifting usually goes on between the trailer manufacturer and supplier of axles and suspensions. Calculating ride height, ensuring frame clearance for all the bits that attach to the axle, and in some cases working out steering geometry is not for the technically challenged.