Are low rolling resistance tires even available for this thing?
(trawling)
I guess so, there are so-called "SmartWay" tires for Class 8 so you should be able to find some thriftier tires.
I was thinking that the running boards were detrimental, you might have to do A-B-A to be sure. If they're bad you could use their hardpoints to install some skirting under your rockers.
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Lead or follow. Either is fine.
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