I believe the heaviest loadmasters were used as semis. It takes a pretty heavy duty rig to pull a tanker trailer like the one in the picture, unless it's just used for show purposed and never loaded with anything, then you could get by with a lighter truck. COE's are more the semi type. Mine Loadmaster is a 2ton and carries a 3 section fuel tank. You can see mine in it's glory days on the Feb. submissions page of this site.

Keith
If it were easy they'd have grade schoolers doing it!