In the past 3 weeks, I've driven (4) M818's home. (3) started on the lot and (1) needed a jump. I picked them up from the lot in Jefferson City, MO.
The GL rep, Mike Snell, was FANTASTIC to deal with, he was very helpful.
Unfortunately, I was not able to show up until 2:30 in the afternoon, right when they are getting ready to shut down for the day.
He was more then willing to wait a little while while I fired them up. I had time to do a quick walk around inspection and check the fluids. I was able to take them for a spin around the lot to test the brakes and determine whether I wanted to drive them 140+ miles, or not.
The point of this is, after all that I was able to pull them outside the gates and give the trucks a thorough inspection. I double checked everything, and really, the trucks needed nothing. I drained the air tank and that was it. I adjusted the mirrors (bring a 7/16" wrench) and took off.
If nothing else, can you use another truck on the lot to push/pull start it? For the truck that needed a jump, I just drove it home and didn't shut it off until I arrived at the end destination. During the drive the batteries accumulated enough charge and it starts right up, now.
Mike had a pair of slave cables to jump the truck, you may want to call the GL rep at the lot and see if they have a pair of cables that you can use. If not, then bring new batteries, as mentioned above.
Andy