:R
Gas stations are built for GENERAL PUBLIC USE.
Often the chunk of land they have is insanely expensive and often very restricted in size and access roads in and out. Often the township/city may have additional requirements and restrictions which may limit the design/layout of the station.
Darn hard to justify buying 40 acres of land just so you can get your oversized "land yachts" in and out..
Don't like the stations layout and size, MOVE ON, you WILL find another one that can accommodate your oversized rig.
Can't find what suits you? Then quit whining and put all of your money into building the ideal gas station "Empire" for oversized RVs and see just how much money you bleed..