About to buy a FR Surveyor 295BHS Appreciate Expert Advice!

You'll probably be somewhat over the truck's payload capacity with that many people & a heavy, big trailer, but with the proper WD/sway control hitch, you should be ok. The Tundra's engine & brakes are plenty capable, at least.

You may be ok with that size a/c - you can always supplement airflow with a small portable fan or two. As for the size of the slideout, I wouldn't be concerned about that either. Some people might even prefer a smaller one, to fit into heavily wooded campsites better, etc.