I did this on my 78 Scout II, but noticed a couple of things after it was done:
1. It's a good idea for a covertible (my Scout is)
2. Getting rid of the carpet will also get rid of a lot of sound and heat insulation. It will get hot and it will sound like a tin can in your Tahoe. Bedliner does not block heat at all.
3. It'll get dirty and is not the easiest thing to clean. Dirt particles get caught in the grit of the liner.
4. If you spray bedliner over any rusted spots, it won't stop the rust from spreading.
5. wires are hard to hide. Luckily, I only had to hide speaker wires on my Scout.
6. Did I mention it will get really hot?
A lot of my Scout friends spray bedliner, then lay dynamat, then lay carpet on top of that. It gives the durability of the liner with the heat and sound insulation of carpet.
I drove my Scout with just bedliner for about a year, and especially in the summer, I could not stand the heat coming up from the floor and transmission hump any longer. It was like an oven, with heat soaking me from the floorboards and my black soft top. So I installed some snap in carpet with jute backing attached to it, and it works great. Looks good, cuts down on the heat a bunch, but is easy to remove if it gets wet or dirty, or if I want to go out on the trail or beach. The best of both worlds, IMO.
If I was looking to redo the interior of my Yukon, I'd look into doing the bedliner with snap in carpet as well. But IMO, some type of carpet and insulation under that carpet is necessary to keep your Tahoe from becoming a rolling oven.
Hope that helps.