Really surprised the mods have not removed this thread. Obviously a paid ad (getting a free unit in exchange for promotion).
Back to the topic... we have fulltimed for 5 years. 4 of those were with the first gen and now second gen Girard tankless water heaters. We absolutely love them. They use less propane, remove excess weight while towing, provide a steady stream of hot water.
They are not good for exactly the type of use the op suggests. Due to the cycling of burners and on/ off nature they are ideally suited to use where you have city water and sewer hookups. They also work best after upgrading your plumbing to use a household style pressure regulator.
We love our tankless water heater and we paid full price for both girard units. I installed both myself.