Twin 30,000 BTU Furnances

[JAB]

My husband and I were looking at the 2009 Mobile Suites.
We have heat pads on our tanks now and really love them. We are fulltimers in Oho. We noticed DRV offers a Canandian Package with
twin 30,000 BTU furnances, heat pads and elbow heaters on drain pipes

Does anyone have or know anything about the twin furnances ?
Do both furnances run at the same time and also do they use more propane? Are they more efficent than the standard furnace?

Thanks,

Joyce