Bill:
You don't say where you're based, so this advice may not apply.
When we bought our MH, it was 8 years old and still had the Goodyears that Ford had put on the chassis in 2001. The first thing we did, after registering it and paying the horrendous sales tax Washington State imposes on used vehicle sales, was to get all new tires.
Out west, we have a tire company called "Les Schwab". I'm not sure how far east of the Rockies their stores are spread. We got a set of 6 of their "house brand" Toyo tires for a bit under $2300. Bear in mind, our rig uses 19.5" tires.
We've been very pleased with the Toyos. Even with a relatively limited exposure to the GY's, the Toyos are much quieter and ride much more smoothly. we've used Schwab and Toyo for the best part of 25 years on at least 6 different vehicles and have yet to have a less than stellar result.
On one occasion, we had a leased Honda Accord and suffered major damage to a front tire. The lease stipulated that tire brands had to match, and it had Michelins. Our local Schwab store got a replacement Michelin for us so we could meet the lease requirement.