The seat post can be cut and rewelded. It would be a minor PITA to remove but not prohibitive. There are any number of after-market seat replacements online, from mild $$ to quite pricey. Check with an independent RV repair shop.
I'm wearing trifocals now but my hindsight is 20/20.
Bilsteins and Sumos front and rear...HUGE! FatMat and Hoodliner...HUGE!
Hellwig sway bars F&R, 235/85 Hankook ATM, alignment...HUGE!!!
Battery watering, 260watts Solar and BigFeets to make life easier.