Help with Airflow into bedroom.

RoyB wrote:
I am surprised that your setup does not have vents built into the ceiling...

Why? The Keystone Summerland series is considered an entry level product so one can expect to give up some features that may be found in other more expensive models, ducted A/C being one.

To the OP - since uneven air distribution is an issue for you I'd be inclined to permanently mount a fan or two within that dividing wall between the bedroom and main cabin. Scan for any interior studs and plan accordingly, and when you do cut use care to not cut any wires that might be inside the wall. A small box fan would work but you might also consider this type of window mount fan I use myself in our own trailer to draw fresh air into our rig. The adjustable side panels would make it particularly easy to fit snugly into any opening you might cut in that wall, particularly if you first frame out the hole so the fan has something to which it can be secured.

3 Speed, Reversible, Twin Blade Fan