I'm using my VRV 26 FB right now. I have only had it about two weeks and I'm on my way to Daytona. I have not had time to measure the tongue weight but I believe it's far less then 800 lbs. I have this thing loaded with much of the weight from the center of the axles back. Being a front bedroom you really can't put that much weight forward even though I have my storage compartment filled.
Cranking up the dolly is effortless. On this trip I had to loosen up the weight distributing bars to almost fill soft.
You haven't said which VRV your interested in.
None of the VRV's that I have seen are going to be a problem with your truck and many can be pulled with most 1/2 tons.