Does it run? Need more information.

Worse gas mileage. I calculate miles per dollar when my car requires anything besides 87. Harley recommends 91, I usually use 92 due to availability.

Diesel and 0000 steel wool.

4 of the 5 I could do, I’m pretty stupid.

Installed a light bar.

Yes, but not far.

Brakes

Always in pairs.

There’s rust?

Beadblaster, paint

On the back, traction while in a curve is most important on the rear of any vehicle.