Mine has four thermostats. One in the bedroom for that AC unit. One in the middle for the front AC unit. I think both are supposed also act like heat pumps and make heat. I only tried one once and wasn't impressed.
Third thermostat (in the middle) works my Fantastic Fan in the kitchen. I had to ask here about that one. Never thought a ventilation fan needed a thermostat but I've grown to like it.
Fourth in the middle is the LP furnace. I wasn't at all sure how it worked or if it needed a pilot light lit first. So I took off the outside cover and poked around. Good thing I did as there was an impressive paper wasp nest in the vent tube. I sussed out that it was self-lighting. I left the cover off because I didn't trust it. Took forever to finally light off that first time but after that it cycled on and off nice as you like. Fan isn't hugely powered but I still like it. Puts a bit of moisture in the coach though so we have to vent that.
My LP water heater works the same way. Make sure there is water in the system and flip the LP switch. Mine also has a switch for it to work on electric only. Would have been lovely if someone had ever labeled the two or made mention of them in the son-called "owner's manual". After the furnace wasp nest I made sure the water heater was clear before trying it. Now that I mention it, I haven't used either in a year and am going camping in a couple of weeks too. So I best give both a looksee.
On my '93 the cabinet door right over the entrance door has switches for the chassic and coach batteries and gauges for the tanks (which don't work). Off to one side is the water pump switch, all by itself. That is labeled but looks like the label will fall off at some point. To use it simply put water in the fresh water tank by turning the fill valve to opposite of "city" water and turn the pump on. Ok first you cross your fingers and pray for no leaks and THEN turn it on. Or that could be just me. I turn of all the faucets to purge air from the system and it's done. Listen for water running. Go look in your wet bay(s) and make sure nothing's going on in there. With all quiet you should hear the pump going BRRRRRMMMMP when you turn on the water. Mine had a leak that was letting pressure off so the pump ran a few seconds every few minutes one time out. Couldn't sleep that way so just turned it off at night. (It was an internal type leak, no water was coming out anywhere.)
I may not know whole bunches about these things, but I can certainly relay info about what dogs have bitten me already.