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Buy a better quality sleeping bag,one that'll let you walk in the morning to get a boost,or carry a jump box with you,lol. Either of those will kill a battery overnight. If your truck only has the 150 watt invertor,good chance the 200 watt heater won't work ,and for sure the 1500 watt one won't work
Way back when the wife and i were first together,i put a cap on the box for camping and had a 4" thick piece of foam we'd put under the sleeping bags,and we could sleep in the box fairly comfortably at temps down to about 15F.If you have a tonnue cover,you could probably do the same thing,but a cap gave us lots of room for extra curricular activities before bed,lol
