Welcome to the forum & irv2.
Congratulations on your new Newmar many safe miles ahead for you.
You are due for new tires.
If you have original Michelin's
on the coach now you have my answer for new tires.
My drive tires are 10 years old Michelin and changed the front steer tires to new Michelin's last year because of tire edge wear.
Here is a Brochure
and a Owners Guide
for you will have coach weights, tank sizes and how to operate coach features and how to determine tire pressure on your loaded coach after weighting with your stuff.
You can shop around for better pricing for new Michelin's.