I know on my '08 23SS, I had to modify the BAL chocks a bit due to the close spacing of the tires. Taking 1/2"-1" off the front taper of one of the Andersens doesn't seem to be an issue from what I've read.
Wish I had seen these a couple of years ago, although I understand the new model is better than a previous model. Going to try talking the DW into a set for the new Flagstaff.
But, I've spent a bit over the past week for "goodies" for this year. However, she's the one who stacks the legos - this looks to be easier for her.