Congrats on the new wheels. It's been a long time but I still miss the freedom I had with the RV.
In searching for two places that will take the stress of hammock hanging, the first place you should check is the repair department of the RV dealership.
Have a talk with one of the staff that does body repairs to a damaged RV and explain to them what it is that you want to do. Take with you the chart/spreadsheet on hanging distances/weight/stress that's available on here.
If there's any places in the new RV that will qualify, they'd be the ones to point them out to you.
Personally, after having hung around a few RV dealers over the decade that I drove a Class A, I don't think you're going to find anything strong enough but there's no harm in asking!!