Hi Joe,
The OVM (on vehicle material) was usually stored elsewhere as it was highly valued by everyone ie, other drivers,other troops(of all kinds),Vietnamese,just about anyone.
Our 2 1/2 t OVM consisted of shovel,axe,mattock(sometimes referred as a pickaxe),air hose,air chuck,hydraulic jack,tire tools(bar(s)& wrench,a small tool roll(mainly screwdrivers,small wrenches, etc to perform driver maintenance),5 gal fuel can and I'm positive I'm forgeting something(s)In Germany we had enough tire chains to equip 6 to 8 wheels.I did not see them ,again in my AO,but I've seen pics of other units/ other places using them.
Just under the drivers door is a compartment where most of the tools were stored as it had the ability to be locked with a padlock. Obviously the longer tools were supposed to be strapped on the tool rack you refered to.Easily accessable to all.
I find your attention to detail refreshing in this increasingly "whatever" world.Hope this helps.
BTW occasionally unit histories show up on feebay or the 'net that have pics taken during very specific times of the units service.My 25th ID history covers 1OCT41-1OCT66. Many felt it wasn't worth the money at the time,but I knew I might enjoy it one day.
Regards,
Jake