With a 5.99m M/Home, I can just about get into a normal bay, especially if there's a flower bed/soft landscaping area I can get the rear endd over. But, if I have to take part of a second bay, I do find a Security Guard or staff member and ask if the parking is ok before we start shopping. If there is a problem, we find another supermarket. No point in causing aggro or difficulties, just a basic courtesy. On a couple of occasions, I have been asked to park in another area, e.g. close to the loading bay which is larger and safer for the Motorhome etc
Having had a couple of temporary contracts as a Security Guard when I was still working, I am aware of the grief that customers can cause, so getting the Guard's prior clearance gives him/her one less problem and keeps me clear of any unpleasantness ... I also operated my own business in Shopping Centres 2007/09 as a sole operator. To stay safe/profitable, I depended upon the Security Guards to keep an eye on my Stall for 2 minutes if I needed to nip to the loo, and, having asked politely, they would often find a quiet place for me to park my then VW LWB HR LT35 Van. 'Look after the Security Guards and they look after you' never did any harm!
Steve