Wow! You got a lemon. We have 2017 Thor 35 sf and the only trouble was a screw got loose that holds one of the slide motors and caused it to hang up. As far as running the refrigerator, your alternator will keep the batteries charged going down the road. Shouldn’t have to run the generator. Batteries should last a couple of days running the refrigerator through the inverter. Run the generator a couple of hours every other day to recharge the batteries. We love our Thor.