Deacon
Iwould agree with Mike, And Airspeed go with a bigger tire less chance of having problems down the road.
You could probably buy the 8" tire to save a little money then buy some bigger rims & tires from discount tire or some other tire store.
Myself I bought the 12" tires on my last build, Then I ordered some chrome rims and tires, And I mounted the stock 12" tire under my trailer for a spare. (New tires and rims have a much higher raiting on them not 55mph max speed)
Deacon you can check out my web page and I explain and show you the difference, On page 9 of my teardrop construction section.
I hope this may help you. You may also get a few more ideas from my build page. Good luck with your build. (I am also starting a new build)
Ken F.
(
www.VegasTeardrop.com)