Tank heaters

[Gmdiii]

I have a 2018 Montana High Country 344 RL was going to do some winter camping and I was just wondering if all four tanks two gray one black and one fresh have tank heaters on them I cannot find it anywhere in the manual and I was hoping someone new thank you very much

 

[LHaven]

That sort of information is more often in the specific brochure than the general manual.
You can probably find the brochure for that year online... but really, the fastest way to answer this would be to look for the heater controls. They come in all styles (here's mine from a 2019 Cougar, I added the bottom label as a memory aid) but there will almost certainly be three of them and located indoors, in the vicinity of your tank readout panel.