Iv’e lowered my seat by modifying the swivel base. Took it apart, grinded the weld of the vertical tube to the bottom plate, shortened the tube by approx 2 inches and welded back to the bottom plate making sure everything is aligned.
Some mods are also needed on the top swivelling part where the seat is bolted on. The bracing from side to side has to be cut of as it will hit the bolts that hold the base to the floor.
I’m aware that my mods could affect ‘crash performance’ of my seat and safety belt as they are not oem approved but i don’t mind at all, I’m the one driving this RV for my pleasure and having a proper seating position is a must.