If your unit doesn't already have some fantastic fans installed, I recommend them. The TT we had didn't have them and actually besides the bathroom vent, it only had one other vent opening in the bunkroom. The master bedroom didn't have a vent opening at all. On the motorhome, there was a vent opening over the master bedroom bed and over the front cab bed. Had the fantastic fans installed that can reverse the way the air blows. We will set one to draw in air and the other to blow out air. Great cross circulation. You can get them with the auto opening and closing feature, but we didn't go that expensive on ours.
We had them put on the Fantastic Fan Ultrabreeze covers with them. Supposedly better airflow of the other traditional ones. I can't say if they are as we really can't compare. I had them put one over the bathroom vent that was already there as well.