Just get the RPM Narrow's, they are made for 2.2" tires, for other wheel sizes I would go with Pro Line, they make there wheel's out of nylon just like RPM.

 

 

As for tires, I have used Geolanders and Gladiators and will highly recommend them both, the Geos are great for any terrain, but are not specialized in anything in particular, while the Glads are meant for grass and dirt, they work great on-road as well but they will wear down faster than the Geos.  If you want to get MT (monster truck) tires, Mashers are one of the most commonly recommended tires out there.  Other than that, if you want sand paddles, street tires or anything else, take a look at what Pro-Line has, they are definitely the best tire manufacturer out there: