hmmmm, one needs to upgrade to bunks...hmmmmm never had bunks with 4 kids! had a 24' TT with a 3/4 double, twin sons slept on couch, daughters the dinette.....never an issue in 12 yrs. OH, we spent most of the nights at a local ski area in the snow and ice and sub freezing temps.
One thing I will say, is those two kiddos will want to bring a friend along, then you have the potential for "6" adult sized folks on board when the kids are teens, and you will have 900-1200 lbs of people in the truck, 1000 lbs of hitchwt. a bike or two or 4 in the bed, some firewood, and you have 3000 lbs of junque in the truck! Not sure too many crew cab 15 series trucks will do this.
Hence why with my 6500-7000 lbs trailer I always had the higher PAYLOAD/gvwr truck I could get in a SW version. Usually a 3500 in reality. BUT< I will admit, I used my truck in my landscape biz, and my paultry 6500 lbs travel trailer was a puny trailer, compared to the one I hauled a bobcat and mini trackhoe on, that was usually 10500-11K on the axels, and 1400-1600 on the hitch! But I did not have my ex and 4 kids totaling 1000 additional lbs to my 220lbs. Oh, did I mention my twin sons were 5'12" on there 13th b-day!
marty