Brian, I have the same 225/75r15 tires on the front of my 37. I also have the 5" rims. The only problem I have found so far is the sidewall of the tire rubs the tie rod end when cornering. I have replaced the old style tie rod ends with modern ends, but there is only about 1" or less clearance to the sidewall when wheels are straight. The problem seems to be the 75 series sidewalls. The 5" rim works but is really too narrow makes the sidewall stick out farther than on a wider rim. I am currently rethinking my situation before I get my 37 back on the road. Yokohama makes a tire called the RY215 that is supposed to be taller & narrower. I'm looking at this tire for my 37. Charles