When we were traveling I always called ahead after looking at the parking lot on Google maps. I called one store that looked like it had a small parking lot. The woman who answered said no overnight parking, we share a parking lot with a strip mall, I thanked her and said goodbye.
Walked in once and asked, the mgr., he told me where to park and to be gone by 8AM when the auto tire store opened. When my alarm sounded at 6AM I looked out the windows to find I was surrounded by semi's and 3 MH's.
Everyone was polite and left me a driving lane out. We dressed, ate breakfast, watched the weather on a local station and I was gone by 07:30.
When we were MH shopping, the #1 priority was, everything had to be usable when slides were retracted.