We installed one and it is one of the best mods we have done. Solved several problems in doing so.
We like having white noise when in busy campgrounds. We usually had a sound generator to drown out the noise of other campers. The constant running fan now achieves this.
We have a bunk house and our daughter would have issues on cold nights in the top bunk with condensation with her breathing. Water on the roof and damp bedding. Again, with the fan constantly running, it circulates fresh air through her bunk removing the condensation for her.
Originally we had issues with the camper overheating. Yeah it is only 1500 watts, but after several hours the inside of the camper would exceed 85*f with us waking up sweating. I tried opening vents and windows but found it was easier to install a thermostat from a electric baseboard heating system. Now I can control the temp independently from the fan. This saves us propane as well. Many of our trips the propane heater never kicks in. Early last spring the temps dipped to the low/mid twenties. The strip ran 24/7 and the propane heater only kicked in on occasion to help it out.
YMMV, but it is invaluable for us an I will do it on our next camper. One add is that I have to clean out the condenser on the roof more often with the fan running on a more continuous basis. Seeds, leaves, cotton, etc builds up and reduces the efficiency of the ac system.