Not a big enough trailer

Here is our dilemma, we bought a new 2009 31red heartland north trail a few years ago, with a loan. (So we still owe). We like most things about the trailer. But due to a slow leak the floor in the family living area became soft and will be getting replaced after the camping season is over. The floor plan use to be sufficient for my family, but it seems we always take extra kids and that makes it miserable for my husband and I come morning time. I just want to sit down and drink a cup of coffee, but there are literally bodies everywhere. Not to mention, the takedown and set up they have to do just to lay down.

We have a 19yo daughter, that goes with us when her work and school allow her time, and our 12 yo boy that would take his whole entourage if we allowed,lol. He usually has at least 1 friend, and our 2 nieces his age are usually along.

Trading up on a bunkhouse is not an option due to the damage. So we have tossed around the idea of taking the master bedroom and converting it to a bunk room. We are not afraid of diy, we have built houses, and extensive high end remodels. My question is for the "very knowledgeable on all things RV related forum members" are we crazy to think this is acceptable? And if it is acceptable, will moving the kids to the hitch end help to eliminate some of the added wiggle we experience at night during sleeping hours.

Please don't hesitate to throw in other possibilities. Except for pitch a tent. They aren't tent kinda kids, and I'm not a tent kinda mom. Lol