I try not to leave a lot in my truck when I'm hiking away from it for days, but there are a few of those things that I've taken out of my pack, that I do leave in the truck. If I really need something, I'll hunt back to get that item. Two years ago I was 7 or so miles in on my third day and hunted a loop out and across ridges that brought me within a mile of the truck. I stopped in as there were 'reserves' there and hunted back to camp that afternoon.
-Steve