The Olympic Wave heaters are very popular. Sizes 4, 6, 8, I think. You can mount them on the wall or use feet on them to move the heater around using a flexible hose plumbed to your propane source near the stove.
Fulltimer Class of Late 2015, with my bride, Lori.
2015 GMC 3500HD Denali DRW CC LB TrailerSaver TS3
2016 DRV Mobile Suites 38RSB3, MorRyde IS