In the limited research I've done recently while looking into the promaster city I came across a company named Alpine Mechanisms. They seem to be pretty much a sprinter van company but did dabble in the promaster city and they made their own 1.5" lift for the front that I believe they sell. Google the name and look through some of their completed project pictures. I found most info on their promaster city scouring through instagram pics from 2016. Seems they were able to fit a BFG KO2 in the 215/65R16
Good Luck in your search