Sounds like you had a great time. Next time, pop over to Balmoreah State Park for a nice cool swim.
I've never seen the caulk melt in a trailer but my wife and I rode our motorcycles down to Big Bend once and couldn't park in the welcome center's parking lot because the bike side stands dug into the hot asphalt too far and they would not stay upright.
2016 Ford F150 Platinum
2013 Coachmen Freedom Express 233RBS
Prior: Jayco Pop Up, Shasta Bunkhouse, Rockwood 2560G Pop Up