Tell us about the tires. Make, model, size and date code.
http://www.discounttire.com/dtcs/infoSidewall.doIt may have had Uniroyal Laredo HD/H OEM LT235/85R16E tires.
If so and they are original installed tires it is time for new tires before that trip.
There are only three tires I would consider if it has 6K axles.
Michelin XPS RIB
Bridgestone Duravis R250
Bridgestone Duravis M895
Now if it has Goodyear G614's, again it is tire for a new set.
If for some reason it has Special Trailer tires it is a few years past time for new tires.
I found this:
http://www.nuwa.com/cgi-bin/dbsql-2.1.0/db.cgi?db=tbl_2007_coach&do=search_results&series_id=4&coach... So it appears the first part of my answer is what you want. New RIBs, R250s or M895s. I would not install poly carcass LT's on this rig. The three I listed are steel ply carcass tires.
Chris
2021 F150 2.7 Ecoboost - Summer Home 2017 Bighorn 3575el. Can Am Spyder RT-L Chrome, Kawasaki KRX1000. Retired and enjoying it! RIP DW 07-05-2021