Ok, just measured my wheel base and the best that I can tell is that it is now 124.812" (124-13/16") from 123.25" (123-1/4") for a grand total of 1.562" (1-1/2") extra wheelbase. That measurment was taken with the wheels on and given that I had my tounge in the right position too.
PS-It is a LWB....soon to be a SWB.