Be careful when selecting one tho, and do not make the mistake of buying one of the steel GI ladders with 4 treads intended for Shop Vans.
The one that is made for the 6X6 Cargo is the MX-3391 G, Boarding Ladder made of Aluminum. It is 62 1/2" in length, has 6 Treads, and attatches at the correct angle of repose for the treads to be level with mother earth.
There are two versions, each has two lanyards to attach to the truck body in order to stabilize it. The late version comes with a quick attaching handrail.
Expect to pay up to $125.00 as the demand has reduced the number available.
There is a shorter Aluminum version (4 Treads) that is perfect for you M-37/M-715 lovers.
I have both, and will take pics so that bill can post them.
Another useful tip from 'ol Joe here.
