Hey,welcome to the truck camper world!!! Something I did was to buy a small cermic heater from Walmart a couple of years ago. I have camped when it was in the teens and stayed warm .I also set the gas heat to come on if the electric heater can't keep up or loose power.
When I had my other truck I had the air bags installed ,I kept about 50 pounds in them. This new to me truck that I have now does not need any mods to it. It does need a anti sway bar . Good luck with your truck and camper looks like you have a nice set up.
