That was my thought of what you wanted...
Instead of storing his rv at a storage lot,
a buddy who hated renting
,
bought one of those 'semi fulltime' sites at a nice rv park near a lake...
when he built his deck, he parked the rv,
dropped plumb lines to mark the ground, and built a folding section next to the rv... even painted lines on the site so he'd know where to park...
oh, he used a winch setup to fold and unfold it...
and yeah, he was anal, and a good diy'er to have as an rv buddy