#1 , I applaud you for taking the time to research the mechanics of this on a professional level to insure the safety of your family as well the rest of the people on the road. (people like me :B )
Re: those two TT choices is splitting hairs, they both seem pretty close and I would pick the floorplan that suits you and the other person using it because if everyone is not happy.....u know the rest .
With ALL TT's, it's about tweaking things to make it a little more solid and livable and you have to expect to be doing those little 'fix-me-up repairs' in this rv thing we do.
That's why a good dealer will take the time to do that tweaking before you pick it up and not leave it up to you or be wasting your time going back there.
These RV mfg.'s leave this all up to the dealer to make sure the shades, tv's and water pumps and everything else works, the mfg.'s do not do it, they just slop them together and push them out the door.
I think the Tahoe could work well enough if you take the time to get it set up right. Expect your real 'rolling down the road' tongue weight to be about 12-15% of your gross weight.
Some hitch companies believe it's best to eliminate or minimize the possibility of sway rather try to control it after it occurs.
IMO, I think the WD hitch itself as well as the setup (installation and adjustment) will be most critical when using a shorter wheelbase TV (tow veh) such as a Tahoe.
Shorter WB vehicles tend to experience front end lift which makes steering lighter, increases chance to sway. Handling in general may be compromised if the hitch is not set up incorrectly. It can cause a driver to try to over-correct, worsening the sway situation.
You can minimize this by choosing the correct hitch and doing your own 'setup' research to get it right . I think that's the best advice regarding your Tahoe and it's ability to control the TT, not the other way around.
You can start by reading the below link to get a better 'general' understanding of what 'you' need to do and do not rely on a dealer to do it for you.
Hitch setup tutorialBob