"
.... I want to take every precaution that someone doesn't try to start it while it's in gear. It's always that rare time you aren't around and some genius tries starting it while it's in gear causing needless of damage ...."
all you need Smokey, is a simple battery cutoff switch, under the hood or under the dash .... and maybe not leave the key in it .... and have a sign telling folks to keep outta yer truck when you're not around

Bill