Not really, low and high means the AC fan will run constantly at that speed. If you also turn on the heat which Is a separate function the heater fan will cycle on and off. Auto, low and high fan work with the AC and has nothing to do with the heat . It does sound confusing. But if you want you can run the air conditioning fan constantly and run the heater to distribute hot air throughout the trailer.
2015 RAM 3500 SRW, 4X4, 3.73, 6.4 Hemi
2016 Eagle 338rets, Maxxis Tire Upgrade, Slide Toppers, Backup Camera, 2 - 15K AC units
Blue Ox Sway Pro Hitch, 2000 lb. Bars