Doug
Do not forget about your wiring harness for your lights.
And in reguards to better tires and rims, Take the tire & rim that came with your trailer down to a local tire shop like discount tire to match it up,(proper bolt pattern) if you go a bigger rim or tire be sure you have enough clearance between fender & tire you may need to adjust your fenders and do not forget to make sure that the center of rim has the depth you need so it dose not rub on the side of your trailer,& remember that a bigger tire will overhang the sides of your rims more so be sure to take that into acount, I hope that this makes scense to you. If not let me know.
I went to bigger tires and rims on my last build in which you can see within my Teardrop construction pages on my website. I might be selling my black Teardrdop after this weekends camping trip, Starting a new build.
Good luck on your build.
Ken F.
(
www.VegasTeardrop.com ) New Tire next to old tire

New Tire & Rim

Stock tire
