We looked at models where the "entertainment center" was more fitted in somewhere rather than designed around. That way when we didn't buy the TV there wasn't a really a "hole" where it was clearly meant to go (there is a cable plug sticking out of one wall, which I plan to camouflage with art work).
The other thing that irks me is that whoever "designs" RVs has hideous taste in fabrics and materials. I have yet to see one (that costs under $100,000) that actually looks tasteful. I'd have preferred lighter cabinets in the RV we bought, but everything else about the layout was right.
Some day I will reupholster everything, pare down those tacky multi-fabric valences (that can't be more than stapled cardboard) and go for my own version of tacky - tiki (grasscloth wallpaper and bamboo blinds) or coastal or something other than all that beige.