Welcome to iRV2.
The cruise speed RPM, is similar to what I've seen in other V-10 posts.
The question is are you ready for the drop in fuel economy. I'm thinking the " C " will be 20% heavier in fuel use than your current combo.
The Wrangler shouldn't be an issue, with a good braking system.
Also the leveling, stabilizing in a site; compared to a 5er.
Many C class have low CCC. but being on a 450 chassis , may not be an issue with this one . Did you look at the weight sticker for , CCC & tow weight ratings?