Again, thanks.
I've spent much of the last 40 years, since age 18, towing heavy boats and some utility trailers. I very much appreciate the advantages of trailer brakes, even when not legally required. I also have a feel for maintenance/repair issues which come with the advantages and the need to rig up controllers for my two vehicles and a friend's Tacoma which might also do some short-haul towing of the proposed PUP. With the Superduty weighing in at nearly 10,000 lbs GVW an unbraked tow isn't much of a concern. I'm OK with occasional short-haul use behind the lighter vehicles, too.
Besides, I don't recall seeing mention of trailer brakes on the small number of lightweight rigs I've looked at for sale ads for. Would I expect lighter units built in the mid-2000s would have them from the factory? A few longer-box and generally higher end units on the market do specify as having brakes, but none of the smaller units mention them.
Foy