I was looking at a 1992 MB 1222 with the intent of making it capable of seating my whole family (we have 7 kids). Mog, since you have owned one like it would you say it would be possible to modify the cab in order to have two rows of seats of some kind with enough foot space between all rows? Looking at pictures online I believe it will be possible but having never actually seen one in person I figured I would ask someone who has had one. Any input would be greatly appreciated.
No problem for 7 kids. My truck was set-up for 9 total German Fireman (2 in front, 7 in back) with 4 of those in the back being able to wear SCBA tanks so 7 kids would be a walk in the park. I would have 4 forward-facing seats on the back wall with 3 aft-facing seats on the center hump. Staggered with gaps so they have full-length floor area to stretch out their legs without intermeshing
(and the related arguing).
Blue - seats,
Yellow-room for seat level storage
There is huge storage under the rear seat and a medium amount of storage under the center hump. You could even have slide-out drawers from the rear to hold a cooler, snacks, school supplies, jackets, etc. The stock front seats are so-so and without seat belts, so I replaced mine with Volvo XC-90 seats. I used XC-90 rears seats which are the same as the front seats in the XC-90, so they track and recline and also have a cool 3rd seat that converts to a 'child's seat' with the pull of a lever. They also fold 100% flat, to facilitate beds in the cab. The MB stock rear seats are just hard rubber pads on top of the aluminum 'boxes' so certainly those would need to be changed.
Towing would not be a problem, but remember all of these 'Euro' trucks are 'slow' compared to 400+ hp 'American' trucks. Happy cruise speed is around 55 mph (a little faster for a former firetruck that has fast axles) and 'hills' are at 45 mph in the best of times and can go as low as 35 mph (long 6% grades).