I guess it all depends on what "RWD1342", or anyone else for that matter, considers modern.
American Racing does offer some of the "big diameter" 5 on 5 wheels in their "Vintage" old school designs. These have the old school backspacing that our trucks need, the old school look, yet big diameters.
http://www.americanracing.com/browse_vintage.aspTheir Torque Thrust II's can be had in 20" through 15" diameters with the "1" backspacing.
Personally I prefer massive sidewall rubber on the tire with a 15" wheel. But then again I am stuck in the 60's. I just don't like the "big wheel with a rubber band tire" look. Reminds me of a Hot Wheels model.

But others do like that look and as they say "Variety is the spice of life."
There are still some old school survivor wheels left out their, though it takes some searching to find them. I'll be hanging these aluminum slots on my '65 C10 this weekend:
http://good-times.webshots.com/photo/2370753750103882008JrsOxXOld school cool, don't ya think?
http://good-times.webshots.com/photo/2963901720103882008XdryNZJohn