I tried a set of 19.5 from my friends RV and fit perfect front and rear. I'm having a hard time finding 8.25x 20 tires. Don't know yet what I'm going to do. I have a question and I looked on the manual but no answer. Between the rear diff and driveshaft there's the Pinion Cage, it has a fill plug. What fluid goes in there? Or just grease? Thank you
