So it became necessary to have an arts and crafts day.
Pull out the scissors, cloth, glue and get creative with some patchwork art.
Design doesn't always meet practicality. In this case, it did 99% of the time. The gap between trailer and rig during turns was fine. Had two inches to spare. Tight tolerances and narrow gaps are a sign of design excellence and quality, right?
Except for the 1% when turning on too deep/steep ditch/entrance incline which narrowed the gap to BANG!

contact. Rub strip knocked off and impact dent on the Styrofoam. But it was painless and I didn't feel a thing.
Managed to get a twin dent on the other back corner as well. Two for one deal.
Luckily it was just a two inches deep dent on four inch thick Styrofoam where the trailer top front roof hit the backside rig corner. Gave it a spanking.
Seems to me I could go about this a couple ways.
Chop off some of the back of the rig.
Extend the trailer hitch or the trailer tongue.
Or patch and pray.
Since I've done allot of praying with my rig, decided upon more of the same.
Smooth a bit, glue, paste on new patch section. More glue over the patch, dry and paint. Not pretty but will do for now.
Increased the gap by removing rub strips and reducing trailer rig overhang.
Will see how that goes.
One can see how a foamie repair can nickel and dime you.

It cost me a couple dimes and nickels for the repair with leftovers that I kept just for this.
And we continue the adventure on the road...
Make it so.