Welcome to the forum and irv2.
Congrats on your DSDP and a welcome to the Newmar family.
Here is a thread
about tire pressures and to follow up on your coach TSB's use this link
, has also much more info for you.
All the links below in my signature have answers for your Newmar.
When you fill your water tank do you over fill it?
If you are not boon docking you do not need a full tank and that will also give you added room to carry more stuff.
Enjoy the forum and safe travels.