Good call Mark. Certainly worth consideration, cuz the cost isn't far off from each other if he has to buy new drums from a retailer, and can figure something out for a Park brake.
The thing about those biggo honkin Full and Semi Float too for that matter, unless those drums have been severely neglected and rivets ground into them, they last a long long time. So if he can find a used set, even if all they have is one good turn down left on them, for say $40 or so, they'll last a very long time. I'd hate to guess for how long since you never know how weight a guy is carrying or towing, or living in an area where he drives a 6% grade everyday, but a good rear brake job on a Full or Semi float could last some of us 20 years or more.