I have pulled them with the Deuce in the past, I am sure the M923 would be more than happy with the task. Airlines and trailer lights hook up the same and it tows slightly nose down. The Deuce had 11R20s at the time. In the attached pictures, you will see a Deuce hauling an MK-18 trailer which would likely weigh about the same as an MK-14 trailer with a 20 foot ISO on it. In the second picture, you will see I had way to much time on my hands one afternoon and I connected 3 MK-14 trailers together. The Deuce moved them but the rear two had the brakes caged. Member PCTrans made a camper out of the exact setup you are describing. He put gutted 5 ton axles underneath it to lower the weight a decent amount.