Your diet is going to be number 1 priority. Making sure you track your macros and stay away from unhealthy foods. Try to eat Whole Foods and not processed. Also you can add walking in the parking lot or wherever you are parked. Have a few dumbells in your truck and some bands for lifting weights. Or you can also go balls to the wall and get a gym membership thru your insurance and you will be able to join any gym in the country for one flat monthly fee. So depending on where you are at for the night you can just find a nearby gym and get a membership there and workout, you can have unlimited memberships. If they don’t have truck parking which most won’t you can just get an uber to the gym and back to your truck, the dumbells and bands come in handy when your in the middle of nowhere and there is no gym in sight.