I did use a place in Nova Scotia that was pretty cool. It was simple and appeared to be a lower cost build as there was not an accommodation for driving through the stalls (requiring less of a footprint).
The cool thing was it had two bays for trailers/RV's. Not monstro-sized but taller, wider and deeper than car units. It also had a turnaround placed on the plot for easily navigating the back up of trailers into the larger bays. A simple vacuum unit with room to navigate around was near the entry.
This diagram gives a rough sketch of the layout. Not to scale as more breathing room for vehicles in the lot but I am thinking two acres would be plenty.
Just talking.
