Filters, oil and tools for the 50 hour service. Don't forget a drain pan large enough to hold the transmission fluid. Trying to swap a full 5 gallon bucket while oil is pouring out will probably make mess.
A shop manual.
If your tires are filed, a tire gauge for filled tires (it's spring loaded so it returns to zero when you take if off the valve stem, and ejects most of the liquid that can corrode or plug it up. With Rimguard I still need to rinse it out immediately or it will gum up).
Grease gun, grease (I use Lucas red #2) and a Lock'N'Lube. A battery grease gun is not needed for a single CUT. Lincoln makes good hand operated guns or you can get the Lock'N'Lube one which has some nice features.
Chains and shackles for pulling logs. I use a cable choker for the log, it grips well and is easy to push under the log.
If you're storing them on concrete you can make dollies for your implements so you can fit more into a space. HF casters and 2x4s/6s work.