I'm interested in the 420s since they are SUV tires. I figure they will be better suited for the weight of the Marauder. I'm looking for an all season tire.

255/50/18 are 28.00 dia"

255/55/18 are 28.94" dia

That is 3.3% difference which should be adequate.

Anyone run this combo?

They do make a 235/55/18 that are 28.23" dia which is a 2.5% difference which is not quite enough.

I'm open to recommendations!