Euro type van tyres are available in LRR. I get up to 50mpg city out of a van the same size as a Ford E-Series -it's certainly not aero or weight on my side.
As to pressures, your rims will be 100% fine at 75psi. Bare in mind that there's a bell curve to tyre pressures for tyres used on surfaces other than rail road tracks - there's a point at which RR starts to increase again.
In once you get to 50-60psi, the gains above that are tiny, and probably not worth the increased wear and tear on suspension components and occupants. The extra crashiness could even fatigue an alloy rim in time.
I only run around 60psi in my van (at ~2tons).
Last edited by oldtamiyaphile; 04-19-2018 at 09:43 PM..
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