Hello and welcome from NC. Congrats on the new Cherokee. I have a different model trailer (sabre fiver) but on the rv (short) queen in this trailer and our last tt (crossroads zinger bunk model), I used standard queen sheets with good results. The bunks on my old tt were a little tougher. We used regular twin sheets but they were a poor fit. I know these answers are probably less than helpful. Hopefully someone with the same tt can answer this for you.
2014 Crew Cab Chevy Silverado 3500 4wd Duramax/Allison
2014 Sabre 34REQS-6