In your position, it's a no-win...for several reasons each way. As stated above, sometimes even the best of friends don't want to hear they made a mistake. My advice is to point him toward a Forum here. Apparently, he's not already a reader or he wouldn't have bought it... assuming boondocking is really his primary goal. On the other hand, maybe he and you are on the same page and someone else in the family picked it and he's doing his best to make do. Anyway... tell him about your favorite boondocking Forum or send him a link and let him educate himself... or not. Not much more you can do without being asked.