Buying first RV for TALL family

Re-think the bunk house layout. A lot of them are for kids and are short, narrow and have limited weight capacities. Our old Jayco TT had a limit of 150 lbs per bunk and that along with them being short would be really uncomfortable for adults. I'm 6'4" and we looked at all sorts of fivers. I wanted a side isle bath that was all inclusive(sink, toilet and shower)all in one enclosed area. There are mid and high profile fivers out there, each with their own pro's and con's. The mid profile's have the bed usually on a raised platform in the bedroom which reduces head room dramatically and I found I'd be whacking my head on an ill placed tv antenna handle and\or ceiling lights. The plus is that they are overall lower in exterior height keeping you safer in areas with low bridges. For instance, my current fiver exterior height is 13'4". A similar mid-profile fiver might be 12'8" or less. That might not seem like much but in reality it's a lot of breathing room when sailing down an interstate at 60mph. High profiled fivers although taller outside offer very nice interior headroom in the bedroom.
As the OP stated, don't be too concerned with guest accommodations. There are real comfy king sized sofa\air beds in the living room that will sleep 2 comfortably. Our 'bed-in-a-bag' sofa inflatable comes with it's own pump and inflates in under 3 minutes. If additional guest accommodations are needed, if it's warm, a tent works well especially if they are kids or teens. Adults may prefer an adjoining cabin. There are grandparents that enjoy camping with their
grandkids all summer long and in that kind of situation I can understand a bunk bed layout. Other than that IMHO I wouldn't waste the precious floor space with a bunk layout. Good luck in your search!
Mike