I've run across some of the Gator G-tour road trunks. The construction was pretty weak. It had fairly cheap casters. The whole thing felt kind of flimsy and consumer grade, I wouldn't expect it to hold up.
The L&M cases are ok, similar to Calzone or Anvil in their construction, but I don't care much for the composite material they use. I rented some speakers from another company that were in L&M cases and the exterior laminate was all bubbled up and had come unstuck from the center core material.
I wouldn't chose either frankly, if you are looking for a basic amp rack, go for an EWI or Road Ready, they are reasonably sturdy for Junior Varsity and light touring usage.