gimpyrobb
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You should try to get them up and under the seat in a roadgrader .8D is a good sized battery (big) and I had to put one in my backhoe without the nice little handholds on it. Going in wasn't so bad, getting the old one out of the tight space was.
You probably have underwear older than those batteries!Those batteries are shot. Most batteries will live about 5 years. The open circuit voltage (OCV) you reported they are dead as they sit. 12.0V is heavily discharged, in the range of 80-90%. 12.8V is a full charged lead acid battery.
The only true test of battery health is a load test. You can do this right on the truck using the starter. You don't need any type of external load tester, but those are OK to use also. Measure voltage across the battery terminals while cranking (prohibit engine from starting). If voltage drops below 10V for any battery, it is not delivering it's rated power anymore.
But, just looking at their age and your OCV, they are dead as they sit. Check the second image down in this link, it gives a reference to battery OCV vs SOC (State of Charge) relationship:
http://batteryuniversity.com/learn/article/how_to_measure_state_of_charge
Even if they would start the truck, there is no reserve in them at all. If you were do grab an air pocket of fuel and needed extended cranking, they would not be up for it at all. A 923 is a lot of vehicle to have sitting somewhere unable to move, and standard group 31's (semi truck batteries) are only $100 each brand new. Go with 2 or 4 of those, and you won't open the seat for another 5 years at least. Try to avoid Exide if possible.
It sounds like your just prolonging the agony of emptying your wallet for some new batteries ,there 11years old there done for . Lack of cranking amps will kill your starter .So the general consensus for charging these batts this weekend would be to disconnect each one and charge to maximum volt of 12.8 volts. If they charge that high.
If you drive that truck to work, you'll miss that attendance bonus, because it won't start.I know they are in need of replacement, I just wanted to prolong their death for a month,So I can get my attendance bonus and buy some new ones.