Upgrading to Diesel from Large Gas'r-??? What Do We Need ???

I keep a primary and secondary fuel filter, a serpentine belt, spare hydraulic oil, diesel motor oil, transynd trans oil, fuses, etc.. I also replace the air fiter, air system water desicant filter yearly. The generator also has it's needs which are similar. Most of this stuff is avalable on Amazon at pretty good prices.

Welcome to the big rig world! Bring a fat wallet and you'll be ok.