That makes me think of this:

:laughing::laughing:
I'd get a good hand truck/dolly with large "all terrain" tires and mod it to fit your welder and tank leave the tank standing along the upright. That way you don't have to keep disconnecting the tank.
It won't hurt to have inert compressed gas cylinders laying down. Acetylene, however, is dissolved in acetone and they must be upright, also if they have been laying down they must be let stand back in the verticle before use.