Propane and electric at the same time? Hot water heater??

I do it when the tank is cold, then switch it to electric to keep warm, but if we need a boost, turn the propane back on.

We use both all the time. Back to back family of four showers and never run out of HW.

I use both every time we shower

Electric alone........slowest recovery rate (roughly 6 gal/hr)
Propane alone.........faster recovery rate (roughly 11-13 gal/hr)
Electric & propane....fastest recovery rate (roughly 18-20 gal/hr)

We do it regularly if we expect to need a lot of hot water, or if the weather is cold and the incoming water is cold.

I have a Suburban, it said right on their website that it is ok to use both. Remember to always have water in it. Electric element will burn out very fast if turned on with no water in it. Also, depending on the campground's shore power, and how much you are using - microwave and/or air conditioner - you might trip a breaker. Turning off electric element on the water heater is a great way to reduce some power consumption and manage your needs.

Thank you!

Won't hurt a thing.

No problem. Been doing it for years.