just took our fifth wheel out this weekend to Whistler for the second time out. Weather was hot and we found the A/C not to be at full potential! Our bedroom and bathroom was very hot. Feels like no cold air at all. Livingroom and kitchen were fine. We start the a/c first thing in the morning and keep everything closed. The unit has a 13,500 btu Dometic, is this not sufficent? Any ideas please?