Sorry we missed you while you were at Golden Shore.
Not sure on the extra inch, but if you haven’t already, you may want to look at the Totcha mattress. I believe halla turned us onto that brand and we loved it in our 2018 Dynaquest XL. When we traded for the 2021 it had the Innomax air adjustable mattress so we didn’t swap it. However, we liked enough that we put it in a guest room at our house.
Joe & Cynthia
2021 Dynaquest XL 3801 TS Cindy 'B'
2021 Jeep Wrangler Unlimited Rubicon Diesel
“Breathe in, Breathe out, Move on”