I have a 2000 34' Fourwinds on a 1999 F53 chassis w 32,000 mi. I just changed the tires for the first time. Had 245 70R 19.6 Goodyear G159. Relatively satisfied. Only changed because I blew two beca...
It is NOT unusual for tires to squirm for the first few hundred miles.
My advice-- give it a thousand miles and THEN evaluate them.
And obviously, make sure they are inflated per your tire manufacturer's recommendation for your actual weight. 30 PSI over or under inflated will make any tire handle poorly. Said another way, the proper minimum PSI per Michelin for the tires on our coach is 70 or 110 depending on weight carried. HUGE difference.