Well then, if you had asked this question a while back, I would have directed you to my BR Pivot and BR Pivot Lite. Rotating, precision benchrest, vehicle portable.
Caldwell still makes their version after I sold the patent and mfg rights to them, but it's not a true rendition of the original, but fairly close.
Mine in the rat patch with my Cooper 20VT aboard, teaching rodents to fly, one squirrel at a time.
If you go this route, beware of what they call their "Stable Table", a cheap knockoff of my original without any bells or whistles, but still serviceable and better than nada.
Another option you may want to look at is the DOA bench. Still in production, mostly a copy of my design and would also serve your needs at a bit less cost. It's also a veteran-owned (USMC) outfit as mine was.
Rusty, if you are considering the Caldwell BRP, be sure to specify the model with the hardwood top and NOT the dinky plastic one. BIG difference!