Hi, Mike and Maggie,
Welcome to the forum!
You've got a great tow vehicle there, but please go to the towing forums and look at the wise advice there. The airbags probably won't be needed for the travel trailer. In fact, if you have the 2500, you may be wishing for a more softly sprung rear suspension. I'm worrying about that now, and I'm even looking at lowering the rear of my truck to level it some just because I don't like dropping my trailer on it and having it (a) not move the back at all, and (2) being way up there even with an 18" high hitch.
The common knowledge here about heavy-duty trucks is to go to lighter lift bars with more deflection to compensate for the rough rear suspension, although some forum members are interested in using "air" hitches to smooth out the "ride" transmitted to the trailer.
Take care of that Cummins, and it will last forever. Lord knows, I have the payments, and I'm counting on that thing staying around and getting me there.
1975 Argosy 28 "Argosy"
1979 Excella 500 31 "Betsy"
1992 Lincoln Mk 7 LSC
2003 Dodge 2500 Cummins "TowHog"
"Lucy Loosehair" the cat - Airstream mascot
Klaatu barada nikto