I was in Elkhart,Middlebury,  Goshen, Shipshewana Indiana a couple weeks ago where most RV's are made.  I'm there a few times every year.  I've never seen such low inventory at the plants and the overflow lots.  Most were just flat out empty.
The only inventory that I saw of any quantity was Amazon Prime delivery trucks and there were hundreds if not thousands of those.  Many of the Sprinter van size but there was a huge number of UPS truck size Amazon trucks.
If they are telling you that inventory is low, you can believe that it's true.