So instead I placed the bed on the dolly, which the wheels can barely hold the weight of. Then I placed the frame on jack stands and used the car dollies to put the cab on.
All in all, a fail and a win.
I believe I will just bite the bullet and purchase an actual auto body dolly that is made for this.
After church I’ll make a low dolly cart for the frame. That way it can be rolled out of the way. And then I’ll start working on the Tin Lizzy.