Swapping Rear

If you dont mind being slower than a snail off the line, not being able to pass worth a damn and climbing grades at 20 mph, no.

Whitelightning

True, but now his mileage will be around 9.5 rather than around 9 mpg. Or 8 when he puts more pedal down to compensate for the lack of pulling power.

or not having enough power to get out of a small hole at the campsite. 9 mpg is not bad for that rig. your best bet is to drive slow like 55mph