After yet another blow-out, at least the 6th in two years, I'm utterly fed up with fixing blowouts and giving Big-O tires $50 and an hour of my life every third camping trip, this is getting ridiculous. I've tried all sorts of tires and I always run them at the PSI suggested on the tires themselves. Had the trailer breaks professionally inspected etc., the ultimate results being the same... blowout after blowout after blowout. Enough. The Kendra Loadstar ST175/80D13 Bias Trailer Tire with 13" rims I'm looking at are load Range C, with each tire having a max capacity about 300lbs more than my current 5.30x12 tires.... they're also the same 4 on 4" bolt pattern, so I think they'll slip right on I might not even have to raise the PUP... There's currently 2.5" of clearance at the shortest spot, I guess changing from a 21.9" tire to a 24" means there will now be 1.5" of clearance... is that enough? Should I have this professionally done if it has to be raised? It looks like a minor project, other than jacking up the pup while I unmount the axle... plus figuring out what kind of spacer to use.... there's no leaf springs or anything to muck with, just two bolts on each side of the axle and it's just bolted to the frame of the pup, doesn't seem like a big deal... Any input is much appreciated, thanks!