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The main thing is heat cycles on the driveline. If you have run the truck up to temp and let it cool several times, you should be fine. What you want is the metal parts to expand and fit together correctly before you put a load on it. In 500mi, you should have at least a dozen heat cycles by now which is great.
Plus, you want to tow early on in the engine break-in to seat the piston rings so I would say it is a great idea to pull the trailer. The big thing would be not to run the engine to redline. Also, use the select-shift and downshift when slowing down to put more pressure on the piston rings to help break-in.
When you seat the piston rings well, it forms a tighter seal against the cylinder wall so you get better compression. Tons on info about this if you search this website or Google:Engine break-in. I rebuild engines as a hobby. I would imagine the owner's manual suggests 800mi to group everyone together but engine builders break their motors in on a dyno under a load after a certain number of heat cycles.
Enjoy showin off the new rig!
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