A ranchers truck gun is likely a 30-30 lever held together with duct tape, but is good enough to drop the 'yote that's dumb enough to stick around when the truck is running.
my truck gun is my TC encore pistol in .223 open sights
It fits in the pouch on the back of pass seat and is easily accessable and Accurate enought for me. Well that and I tend to toss my Ruger MKIII in there all the time too