I've been playing around with the D-Series addon mod for a while and I thought it would be neat to be able to create a true medium duty truck like a Ford F750 with the full size heavy duty wheels and suspension from the T-Series on the D-series. I figured this wouldn't be that difficult to do but I don't have the knowledge to do it myself
The closest thing that currently exists as a mod is the Stubby-T Series, which puts the D-Series body onto a shorted T65 frame. There was a WIP mod for a proper Gavril truck inbetween the D and T Series, but it's been in development limbo for ages.
Stop teasing us, you have no idea how long I've been staring at old pics of that truck wanting it in game Seriously though, thank you for your contributions to the modding community, your mods add a ton that's lacking in the official game.