Sell the RV and get a trailer. Trailers, due to not having the power train of the RV make better use of their space. Also should things get dicey you can ditch the trailer and keep going in the RV. Taking both the RV and the Tahoe would be a huge waste of gas. Taking just the RV limits you when you stop. No making short runs without having to take the whole house with you.
I've been looking at the same issues myself and I'm going with an early 80's full size ford bronco and a 24" trailer. I'd like to get a toy hauler. Not that I have any toys but I like the loading ramp and full storage area of a toy hauler. If we can't shelter in place I can take all my supplies, wheel them right up the ramp, shut the door and go!