We place them based on 551.77 tempered with 2008 NFPA 1194 "Standard for Recreational Vehicle Parks and Campgrounds." So why do I bring this up? NEC requires 5'-7' from the side and 1194 5.2.2.2 requires instead that it be 4' - 6' which means that they can only be 5' to 6' to the stand.
I also chuckle because I've seen parks that once you place the assembly that far from the pad that it could easier be used by the neighbors stand (at least the picnic table).
I would not place them behind the stand, besides not an approved spot and people backing into them, of all things my sister-in-laws trailers slide out is of all things out the back side.
If they are near even with the rear of the pad (back 0'-5'), to have them facing forward is a good idea.
' - means foot. I thought about metric conversion but I am to lazy.
