I got the 2 post unit with arms that swing under. My big problem is that it's outside (had to pour a new concrete slab) and will be shoping for one of those RV covers. With the four post/ramp style you can move it around pretty easily inside and out. I think your garage, barn or building is the first issue, just wish I had the bigger shop.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed