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I knew someone who had a travel trailer and their water heater ran off of both propane and electricity. That's why that's the kind I want if and when I ever get one.
Don't worry they do have combo's dual propane/electric and you can buy a used or new water heater, then thread an electric anode rod into the water heater. The electric rod allows you to run off of electricity vs. propane whenever you get to a place with electricity or if you have an on-board generator. Or else you can get one that replaces the drain plug.
The only down side is depending upon the frequency of camping trips, and whether you're talking once in a blue moon or monthly, 3 months continuous camping and heating usage - the lifetime of all anode rod or glow rods are finite. THey're made to corrode to prevent your water heater tank from doing as much rusting - corrosion comes from anything like high iron or other mineral content in your water supply.
Continuous hot water in my first Class A coach - Bluebird a couple of years ago - would require my replacing the rod every 4 - 6 months, for around $10 bucks (2010 pricing). And the coach only had a 10-gallon water heater most small Casita's and other trailers only have a 5-6 gallon propane heater.
An electric heating element costs around $70-90, and either is inserted in the drain plug or threads in where the anode enters the heater. Problems are with a new trailer or water heater that's propane only and HAS a guarantee if a problem develops with your electric element (add-on) kiss off your Water Heater warranty it's voided, companies call them a safety hazard.
I've adjusted prices downward - apparently they've dropped since the good old days. But, they still void warrantees on new heaters. If you ever buy a used trailer it comes under the heading of buyer beware. If you're thinking of camping in TX in summer - it's amazing just how warm that shower feels when the water tank has been sitting in the sun only for several hours.