I like to place them at the end of the space, off to one side, facing to the front. I don't want the trailer being backed into the, I don't want them to be lost in the bushes on the blind side, and I do want them accessible to the tenant.
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 188.8.131.52 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.
Typically there are two types of RV pads: pull through and back-in sites. My comments are based only on US installations where we drive on the right side of the road and the electrical connection on the RV and at thte site are on the left side (drivers side).
With pull through sites you are limited to only using those on your side of the road for two-way traffic roads, but typically the sites are designed for one-way traffic only. Pull through sites are designed for pulling in forward only, though you could back in which would be silly.
Back-in sites are design with an angle which if looked at from above point in the direction of traffic flow. To pull in forward you would likely jack knife your trailer and depending on the slope of the entrance and how much attetion you are paying, you may bust out the rear window of your pickup if towing a 5th wheel.
Things were designed this way because if you pull in forward to a back-in site style, you block access to your means of transportation.
Thanks for the question. We tend to forget everyone is not familiar with what others of us take for granted.