Re: Espar furnace "ticking" noise
Bruce, I believe mine is mounted using a rubber "hangar" looking thing, so no metal-on-metal. I did not originally hear the clicking noise, but we did on the last trip. Maybe I was simply sufficiently exhausted on the first few trips. I think we both had it installed by the same person, so I'd be surprised if yours is not already mitigated to the extent possible.
1999 EB 4x4 7.3l diesel. Custom layout: 4 capt, big bed, PH, fridge & sink. Aluminess all around, bushwhackers, AR wheels, racks and yakima box on top. Our 2-year-olds have for some reason named it "Moose Van".