I have been using a mattress warmer for 3 years of fulltiming. I can't take the cold, even Florida night coldness.
The beauty of the mattress pad, is you don't have to store it in the winter, it can just stay on the bed, unplugged.
Mine is very simple with 10 settings and no timer.
Oh my gosh, if I could purr like a kitty cat, I would purr every time I need to use the mattress warmer. It is ideal.
On top of the mattress warmer I have a mattress pad and sheets, so the warmer stays clean. I have a big fluffy comforter on top of the bed, it holds the heat in nicely. I have the controls by the bed so I can bump it up or down a notch as desired.
My little dog LOVES the mattress warmer too!
We also have a 12volt throw we sometimes plug into the cigarette lighter forward, but the cord will reach to the dinette or the club chairs or the double bunk over the cab. Puppy will claim that too when I plug it in to keep my legs warm. Do not plug the throw into the regular 12 volt outlets, they tend to freak out.