It's different from say San Antonio and Austin. It's stop and start and people will just cut right in front of you. There are lots of on and off ramps and it's nothing to have someone suddenly decide to get off and cut 3 or 4 lanes over. No matter what time it's always busy. We are talking about going thru about 1 am. That will put us at the ranch pulling the traler about 3. I don't want to put them in the pasture at dark so I thought we could just unload and tie them to the trailer til day break. The other option would be traveling during the day and stopping to rest before Houston but that's extra hours in the trailer.
I think heat is a factor too in the daytime, right? Strong suggestion you may not have thought of. when you do go to turn them out, walk them by hand around the whole perimeter before turning them loose so they see the whole fenceline and don't run the wire.
Were you going to get some panels and put a round pen up? If so, just put them in that until daylight. It would be safer to make a nonstop trip if possible, instead of tying to the trailer in a strange place. I've had horses break halters, lead ropes and the welded trailer ties when they felt like it. If you do stop to wait awhile, just leave them in the trailer - give them some food and water.