Normally you'd only have to raise up one side or the other.

Be sure to support *both* tires when dealing with duals.

I'm sorry.  The industry quit making micro-mini motorhomes years ago for
good reason.

Both wheels.  ...but only when parked.

The collection of wood required for most leveling needs alone will
overload the motorhome.  Good luck.

We had one of those and had a blast in it.  We started bumping into each
other a bit too often and had to trade to a roomer unit.  How about that
engine power?

For a short stay, you can just one wheel without worrying about it.  Yes,
two are "best" but one will do.  For a long stay, you should probably do
both.  Buy some of those orange Lego blocks.  They are strong, interlock and
don't weight much.  We have four sets.  Avoid the yellow ones.  They crack
on gravel.