Coming from a military vehicle background when I see "Ben Hur" trailer I immediately think of the large cargo trailer from WW2. Primarily built by Ben Hur, but others as well. They used the same wheels and tires as a CCKW 2 1/2 truck and are extremely heavy. I know because I have the chassis for one in my list of projects. I forget that Ben Hur was a civilian manufacturer and made smaller/lighter trailers.