I remember a while ago seeing a post - maybe on here, maybe FB(?) - of someone who had an RV that you could rent at the track. I recall that he would deliver it there, all the renter had to do was show up. Anyone remember this, or have any leads?
Just stay away from outdoorsy. They have very shady insurance practices that easily add $400/day to your overall cost. And they get to keep all of the money, owners don't see any of it. I can explain a bit more of you plan on going an RV sharing route.
Galen, founder of Addiction Motors, had a trackside hospitality rig where he'd cook for you and toss up some shade with his tricked out trailer. I forget the name of the company, though, and I don't think he's doing it anymore.