Tires, Rims, and Brake Maintenance

Howdy all,

Getting ready to replace all 3 tires and looking at the prices it's not that much more to replace the rims as well.

So, any advantages to galvanized over painted (worth it?)?

Is it okay for a 2001 2720 to go from 14" to 15" tires (I think yes)?

I see the Goodyear Marathons are popular so I'll look that direction.

Finally, since I'm pulling off the tires I figure I might as well take a look at the brakes. Since I've not looked at these before (trailer bought used) and assume no one did anything to them. What spare parts might I like to have on hand so I'm ready for action (like magnets or the like)?

Any suggestions are very much appreciated. I'm your typical shadetree mechanic with the right tools and patience.

Mac