I suspect something in the truck is taking them down. Check for draw with truck shut down.
2012 GMC LML/ALY 4X4 SLE CC 3500HD DRW - STOCK - FuelBox 60 gal Aux tank/Tooll box - Just fits in the garage, Air Lift Bags with SmartAir Leveling System, Exergy Fuel System Saver, Kennedy Single LP.
2007 Mobile Suites 36' TK3 Demco Glide Ride Pin, weighs 17,500# loaded.
2007 GMC LBZ/ALY 4X4 SLT CC 3500 DRW - TransferFlow Tank Tool Box Combo, EFILive DSP5, MBRP, Fred's 1.5 spacers, BD Exhaust Brake.
2004 GMC LLY/ALY 4X4 SLT CC SB, EFIlive, Mike L SCIV, TRADED
2001 Chevy LB7/ALY 4X4 EC SB - SOLD to neighbor