The added cabinets I built are above the right window. Perfect spot for more storage. My 19Roo is 4200 lbs. My 2018 Tundra Crewcab pulls it with no effort with the 5.7 engine. If you are considering something in the 25 foot range, a good rule is every 5 foot is 1000 lbs. Do not go past 2/3 of your towing capacity so as not to tax the truck. Ford F-250 for bigger trailers and F350s for the big stuff. You may want to climb a hill one day. I’ve towed sailboats and trailers. I’ve camped off and on all my life. I like to learn from other people’s mistakes.