If you want a private bedroom for the parents, then the bunkhouse is pretty much your only option, unless you're prepared to tiptoe past the sleeping kids every night. I am finding it far easier to have them in a private room leaving the rest of the trailer for me and my wife to use.
We were a family of five in a Silver Streak (an upscale cousin to A/S) forty years ago. Parents on the twin beds, my sisters on the fold-out couch and yours truly on an air mattress in the aisle. My folks kept that TT 27-years and knew that we'd most of us be out on our own soon enough (about ten years for the youngest). Don't constrain yourself to this one trip, or one configuration of "parental privacy", IMO.
An outdoor screened room can be added to the main awning. Etc.
Take your time. The TV is fairly irrelevant, the TT is the important decision. I wouldnt go under 28', and if a 30 or 34 is available in best condition then I'd choose those.
P.S. See threads by Pharmgeek as he recently did a thorough go-over of the what and why in buying both TT and TV new for his young family.
1990 35' Silver Streak Sterling
; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 10-cpm solo, 18-cpm towing
Sold: Silver Streak Model 3411