the 4.5 backspacing will make the tires stick out ALOT, your probably gonna run into clearnace issues. Id look into something like 15x8 draglites 5.5 backspacing and a 26x10.5x15 tire, or a 275 DR
I run 26x11.5x15 on a 15x10 wheel, no cleanrance issues (quadshocks are still there) tire actually comes out to be 10" wide, the wheels are 5" backspacing but their pacer so you wont find them, go with 5.5 bs not 4.5, and run a small spacer if you need to.