V10 chattering at 59mph

[jgellis586]

2017 Thor four winds on a 450 with v10 engine, 6,000 miles. When driving at 59 mph there is a lot of chatter when under a slight load. Reducing speed to 56 it is not as bad. Looking for thoughts of what it might be. Will be calling dealership to see what they say.
Any thoughts of what it could be.

[gordhog]

2010 Jamboree, E450 with 25000 miles at the time had a similar rattling. I replaced the serpentine belt and idler pulley and the noise is gone. Also check for broken exhaust manifold studs. A chronic problem with V10s. The broken studs could lead to exhaust leak noise.

Mike