RV should face north or northeast so that the afternoon sun is on the driver side and the passenger side is shaded. We stayed at North Forty in Utah and all the spaces are like this. Very nice sitting out in the afternoon/evening without the sun blaring down on us.
No trees on passenger side is preferred as that is where the awnings are. Trees on driver side should be far enough away to not interfere with slide operation but then again they may interfere with awnings on neighboring RV. So, no trees would be best unless the RV spaces are extremely wide.