Ford, Chevy, or Dodge? Word of caution, these trucks with the low profile tires eat front tires. I don't know if it's the width or simply the use, but the front of duallies with 22/24s always seems to go through some fronts. That aside, I've done a number of trucks. You can buy from any of the players in the industry, American Force, DieselWheel, etc. Just make sure that if you do run a large bolt pattern with an adapter, that you do get a nice, high quality adapter. If rotating mass is a concern, this may not be the route for you. Most adapters are 1/2" billet steel, add the wheels and tires and you've got some monsters. If you chose the adapter route you can save some money picking up some used Alcoa's and turning the bead seat down. We've done a few on the lathe, turned the bead seat down, and I also turn down the actual wheel lip itself, many don't.
Word of caution.. no matter what you're told.. DO NOT stretch a 22 or 24" tire over a 22.5 or 24.5" wheel. I've seen it done, and attempted many times and it's a death trap.