I thought about the tankless unit myself. But after replacing my old one, (Bottom of tank rotted out) with a new 10 gal. Gas/Electric, I find both of us can take a pretty decent shower and not run out of hot water. For the amount of propane I would save, it would take me 2 lifetimes to recover the cost of the unit. I barely used one 30# camping this year.
2003 GMC 2500HD 4X4 D/A Ext. Cab
Propane Powered Honda EU2000i
Lots of Hot Sauce!
Air # 283