I dont know what RV you are looking at but all the ones I have seen that have the overhead entertainment center also have a short cap. If you put the entertainment center in the front of most Class C bunks you would not be able to see or reach them. If this is a B+ then there wont be enough room for much more than a single bed and I dont know how well finished an area is thats not meant to be seen. You might want to check and see if that exact model is offered with a queen overhead bed.
A dealer will tell you anything to get you to sign and then the problems and delays are yours.
