Get some rodent and bug traps, too. Left one of my vehicles in storage for about a year once and when I went to get it out mice had chewed through parts of the vents, wires in the engine bay, dash, seats, ugh. It was a mess.
So traps and bait, for sure. Be prepared, also, that your truck will probably tell you it needs an oil change as soon as you get try to use it. Not sure if the battery being disconnected will resolve that. I left my truck unused in my own garage at home for about 4 months and as soon as I started it up it said it needed an oil change even though it only had maybe 2000 miles since the last.