Long Class A rigs with Trailers - Where do they stay?

As noted, likely associated with NASCAR or racing in general. We were at Tom Johnson's RV in Concord, NC three weeks ago trading coaches (was there for 6 days) and saw a number of those rigs coming and going as there was a big NHRA drag race event going on. Some were in the RV park next to Tom Johnson's and others were parked in a huge lot next to the Zmax race track.