There are several types of RV folks.
1) Young families with kids - want lots of bunks - limited budget - small (1/2 ton) tow vehicle used as a daily driver - almost always want a low price. TT is the market. Folks who drive a heavier truck (3/4 ton) for their daily work would opt for a 5th wheel bunkhouse if their budget works.
2) Slightly older families with teenagers - need room for kids to sleep, but comfort for mom and dad. Need lots of room for bikes, or motorized toys, etc. - Toy Haulers are in this market.
3) Grandparents - need occasional sleeping room for kids - bunks are not necessary but nice - 5th wheel with maybe a small bunkhouse for these folks.
4) Grandparents with almost no overnight visitors - want as much living space as possible and a nice kitchen - have a dedicated tow vehicle (1 ton) - big 5ers
As with any market - the price and profit goes up as the size goes up. The higher end 5ers get all the notice and are quite nice.
But every manufacturer does carry bunkhouse models - just finding them is harder in some price ranges.
As far as carrying stuff - look at the Open Range - Mesa Ridge MF346FLR - big front living room, big kitchen/dining in the middle, big rear bedroom - and over 200 cu ft of storage in the front and rear basements - including room for 2 10ft long kayaks and 4 bicycles.
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