Don't forget rolling resistance. RV are notorious for improper amount of bearing grease and pre set. Figure that axle alignment is not correct. Adding shock absorbers and improved Spring equalizers is also worthwhile as direct and indirect mpg improves. A corrected baseline, in other words.
If tires are ST type, I'd change em out pronto for LT tires of greater loAd reserve. Centramatic balancers also worthwhile.
All of these will lessen effort at the steering wheel. More positive feedback.
Looking forward to how things go.
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