How does the dump trailer operate? Is it powered by the towing vehicle or by a separate deep cycle battery on the trailer itself?
Those used to be all the rage around here, but they soon went out of vogue. It seems the kind with the battery always went dead. You would go to use it and the battery would be dead, which was very annoying. This was not just one weekend then 3 months later use it again, but from weekend to weekend the battery would go dead.
Of course it could just be our cold weather up here too. Your nephew should definately have a spare battery in the truck with him. One that is fully charged because there is nothing like getting somewhere with a full load of gravel or something and then not being able to dump it. That ties up both the trailer and the tow vehicle since unhooking off a fully loaded trailer is not always possible. he might want to have a dedicated charger for it to. Keeping the battery constantly up so its always ready for use.
Not trying to dump ants on your picnic, just letting you know some of the issues we had with ours.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"