T600 with detroit series 60 12.7L opinions?

Hey,
Looking to buy a truck and theres a t600 I've been watching. Its a 2007 with the detroit series 60 12.7 l

Its got 1.6 million miles but had "a platinum overhaul" 116,000 miles ago, which the owner claims he has paperwork to document. I intend to have it inspected however have had very little luck finding an inspector who is close enought to it. I just wanted to ask very broadly if the truck seems like a potential good deal or a nightmare. Photos dont show rust anywhere and owner claims its rust free, but i have little experience with the detroit.

Im not asking for someone to magically know if its a good truck or not, i know thats what the inspections for, just looking for maybe some advice that will either encourage me to keep trying to find an inspector or to look for another truck. Thanks yall

If yall have any advice on detroit specific or just general questions to ask the seller too that would be great. Thank you

 

Its eaton fuller 10 speed
Its a DSP40 rear end
rear axle ratio is 3.55

 

Yeah it was the first one ive seen with a detroit. I didnt realize they didnt come with that motor, something ill have to ask the seller about...
Thanks

 

Im out of florida so I'll hopefully avoid a lot of mountains or hills