With my window-into-time cap on:
I've lived long enough to see the evolution of diesel power for RV's and SUV's come of age. Sometime in the 1970's, probably after the first Arab Oil Embargo, people pulling trailers were looking around for a more econonomical alternative to the Ford 460, Chevy 454 and Chrysler 383 big block V-8 as a towing and weight dragging power plant.
We saw the ill-fated Olds 350 V-8 diesel in Chevy pickups for a while. I had that engine in a 1979 Cadillac Seville. That didn't work out. Then later came the not-so-good 6.2L Detroit Chevy diesel which has a bit more power and not much else. International Harvester was producing Scout II's, Travellers, Travel-alls, and series I, II, and III pickups. By 1978, International procured a batch of Nissan normally aspirated 3.3L, 6 cyl diesel engines (aka:"The 900 pound boat anchor") which put out a whopping 80 HP to go in their Scouts. By 1980, the last year of the Scouts, the ante was upped to 101, neck snapping, turbo charged HP, all from that 900 pound block. I owned one of these; a 1980 Scout Traveller (118" w.b.). It had a lot of torque and coupled to the Borg Warner T-19, all-synchro, 4 speed, close ratio trans, and a Dana 300 T-case, Texas pattern, worked exceptionally well. We averaged, fully loaded with our family out for a month, a respectable 20-21 mpg. The compression ratio was an astronomical 23:1. And it could tow. We did the Rubicon a couple times with this one with a S.O.A. lift and lockers.
The reason I post this little ditty is because in my memory bank I'm seeing a 1978 Scout diesel pulling a 35 foot bumper pull RV trailer down the 5 freeway past San Onofre, struggling in the slow lane, obviously foot on the floor with a lot of black smoke, his 80 HP Nissan trying to be a big boy and failing. Sooner or later one comes to enlightenment about making the truck and power plant match or better yet exceed the load requirements. Chrysler knew exactly what they were doing by offering a turbo diesel in a pickup to boost sales. It looked great on paper. They were after the king-of-the-hill moniker of "the best mpg in a pickup". That's all. Their engineers knew they had to match the oil burner to a tinky little frame, lightweight trans, suspension and running gear, with almost no load carrying capacity.
jefe