My Ferris has 13x6.5 fronts and I ran one into granite curbing a few years ago- went flat - reinflated - went flat again. Took off cleaned bead and added rubber sealant and it’s fine now for last two years
Looked into run flats $150 decided don’t need to spend the $ or change the ride
As for bearings they are easy to replace but why so soon? We’re they run dry? I have bearings 10 yrs old still good at 400 hours on the Ferris and over 700 hours on other machines with no issues