I am 6'1 to 6'3" depending on the conditions I am measured (6'3" is per University of Michigan hospitals with my shoes on, 1" with them off at home)
It may be the dealer or rather the chassis authorized service center can make a change for you, Sometimes there are multiple holes for a pivot.. Sometimes not.. I don't know
But seat adjustment may also be posible, Seats are installed by the body builder, not the chassis builder, so that would be your RV dealer to adjust there.
Home is where I park it!