I put my 1954 M37 up on my new lift for the first time a few days ago. I did some experimenting to determine the vehicle's center of gravity (CG) in its current state and weighted the rear of the chassis to shift the CG so that I could place the CG directly over the center pivots of the lift for stability while allowing clearance for the tires at the ends of the platforms. I think I got it very close.
It seems very stable, the safety locks work well, and of course I make sure the locks are fully engaged before walking under the lift. I can raise the chassis several inches higher than necessary to stand up under it. Of course, with the top and windshield installed, I wouldn't be able to raise it quite as high. The garage has an 11-foot ceiling.
My cunning plan is to 'attempt' to install the new brake lines, fuel lines, and wiring before winter, after which I would move the chassis to our old garage (my shop), which doesn't have a lift, but I think most of the remaining work could be done at a more convenient height, so theoretically no lift should be needed. That would allow me to park my daily driver truck in the new garage over the winter. I would just drive over the lift as if it were a speed bump.
I'm in the process of installing a standby backup generator for our home, which takes priority over the M37 for the next week or two, but things seem to be moving in the right direction.