We looked at smaller ones but were SOLD on the separate bedrooms. We have a 5-yo and the bunk in the back has been great. Right now we utilize the rear "double" bed for his play area and a place to store the dog's kennel, but it will be nice for occasional guests once we're full-timing this spring.
We only have about three weeks of total use on her so far, but we rarely used both ACs (but we're in the PacNW). Once I got a 50/30a pigtail, I rarely drag out the 50a cable.
Can't speak for your Tundra, but I dealt with "borderline" capacity TVs on our previous trailer and boats and decided I was DONE with that...too much stress creeping in from those thoughts in the back of my head every time I towed. I decided to get a truck that could EASILY handle the trailer and I have no regrets.
Towing the 30' requires a little more diligence than our previous SOB (swinging wider on turns, etc.) but that's the only difference I've noticed. Current combination actually pulls better than any of our previous smaller trailers (could be the Airstream design, could be the truck, but probably a combo of two).
Once we start full-timing, we may start to regret the additional length in our 30' as it may keep us out of some National Parks that we would want to stay in. But with a child, it is always a balance of give-and-takes. Having the separate Mommy and Daddy vs. kid area was high on our list of priorities when we started our journey to upgrade from our SOB to a full-time trailer. We fell in love with the 30FB Bunk on first sight...assumed we would have to buy new until we found a locally-owned USED one on the market!
Go for it and see how the truck works out.