Any thermostat that operates on batteries will work. You may choose to add the toggle switch for fan speed or just wire for low or high only. It only effects the speed in the fan only setting . I have used the honeywell focus pro 5000 in my last 3 trailers. There are plenty of wiring schematics on Google for assistance. Check eBay for the t-stat.
I installed a LuxPro 511LC thermostat in place of my original one. Works fine for both Heat and AC. I think I got it on amazon. If I remember correctly, the reason I got this model was that you could adjust the on/off range. Where most thermostats are fixed by the manufacturer.
I hope you like your RV Coleman. I bought one to put in. It arrived on Thursday and I will install it today. I have been waiting for a RV upgrade thermostat. I did not like the idea of modifying a home thermostat to work.