If possible, I would get photos of repair in progress. also get service work orders/documentation of what's been repaired. once your unit is out of warranty, you may need this info "down the road."
We have had 2 TTs that had delamination....one was brand new. For peace of mind, you can get a moisture meter + do a self test on repaired wall (interior or exterior) which will show if moisture is present within wall. Meter is used by marine industry for fiberglass boat hulls. Our local rv dealerships don't seem to own one.
Best of luck to you!
edit: not saying you do have delam, just that water intrusion can cause it to occur :-)
