"Ability to sleep 4, and have room below in case the weather turns bad."
Reminds me of the old joke about "How big is your sleeping bag?"
"Big enough for four skinny hippies or one big Irish cop."
When a boat ad or review says "Sleeps four" that means there are four more or less flat spaces, each big enough for a woman or teen. And how well anything trailerable will shelter you from bad weather, kinda depends on whether your need for shelter includes a real head compartment, or a bucket behind a curtain. And whether you can duck down and not stand up for two days straight.
What's the towing capacity on your Tahoe, as equipped? You start with that, then look for a boat and trailer combination that weigh at least 500 pounds less, because there will be "stuff" in the boat adding more weight.
Easy launching and towing mean less boat. More comfort or better performance means more boat (more keel, especially). One way to look at this is that no matter what first boat you buy, it will be the wrong one and in a year or two you'll want to buy something else. So, buying that first boat with an eye towards resale value (something popular, easy to resell, in good shape but not a silver-plater) and accepting up front that you probably will be reselling it, is also something worth considering.