I know changes usually detract from the resale value but to the right people some changes might enhance the value. 80% of the people who see the changes to our RV want them in theirs. Our RV has no resale value left anyway.
We eat outside except for when it is raining and we try to avoid camping when rain is predicted. With a dozen state and federal RV campgrounds within 60 miles means we average 80+ days of camping per year. Spending close to 3 months a year in the RV means comfort trumps everything. (using that adjective will likely get me thrown out of the forum

).
So I removed the useless very uncomfortable dinette table and replaced it with 2 wall hugging recliners facing the passenger side.
But the valances stood out from the wall about 5". Just enough space to partially block a walkway with the footrest up. So I took them down. Removing them really modernized the interior. Which was timelessly done in good taste except for the window treatments.
So then the outdated purple curtains had to go and were replaced by light blocking mini blinds. Which let in much more light when open and much less when closed.
Of course for maximum viewing a new 24" TV had to be located in front of the recliners. I put it blocking two of the four doors of the overhead cabinets and a few inches of the top of the window. The cabinets on that side were mostly empty anyway and now hold things associated with the TV. Like quality Cambridge speakers, a DVD player and DVDs, a USB flash drive player, etc.
When you rework an RV to exactly what you want you'll never want to trade it for another one.