We have used the Little buddy heater several times and recommend it https://smile.amazon.com/Mr-Heater-F232000-Indoor-Safe-Portable/dp/B002G51BZU/ref=sr_1_1?ie=UTF8&qid=1524614994&sr=8-1&keywords=little+buddy+propane+heater
Finally got to use our RTT this past weekend, really happy with it! We went to some festivals in Tennessee so we spent the night at Marion County State park.