well... the attachements don't work, but I can tell you your problem, you don't have the kit for the larger tire size, and your tires are too large

 

I don't have tires on it atm was jacking up the axle in the back. One side has a lot of room and the other side hits and I thought I might have adjusted something wrong.

 

I had this problem.. when it was aired out.. the rear attachments would hit.. just when aired out.. you have to lenghten the bottom bars some.. It will fix the problem.. when you get tires on and you set your pinion angle it might fix it to.. but lengthing the bottom bars will do it