I would put stanadyne or some other diesel fuel additive and fill up your tank. When I left my truck sit while I was in Korea (sat for about 6 months without being started. I changed my oil, put it on jack stands, had stanadyne added during my last fill-up, and disconnected the batteries. Had no issues when coming back and getting it going again. Granted my garage was heated, but I had it set to the lowest temp I could on the thermostat.
for yours, if you have rodents like mice that could get in the engine compartment, place some dryer sheets around the engine bay and in the exhaust pipe It should keep them away and not chewing your wires.
There are mice in the garage. I put sticky traps around the tires and triple wide around the perimeter of the truck.
I'll do the dryer sheets too, thanks for that tip.
2012 LML CCSB 3500HD B&W turnover Ball, Diamond Eye Down Pipe, Flo-Pro 5" Exhaust, S&B CAI, Fass 150, Beans Diesel Sump, EFI Live, PPEI tuning, 4.56 gears, Cognito 4-6" lift, with PISK, & Cognito UCA, Deaver Mini Packs, Cognito traction bars, Kryptonite Tie Rods, Fuel Revolver wheels, BFG All Terrain 285 65R 20 tires. http://WWW.DMAXSTORE.COM/