Interco is the manufacturer. The size 34 x 9.50 x 15 seems to be from their Narrow Super Swamper category. The LTB model has a tire in size 34 x 10.50 x 15. Some users on this website with experience with the 9.50 size have said that they are prone to coming off the rim in rough terrain.

You mentioned ball joint spacers and torsion bars, so it seems that you have a 1986 or later truck, which has a wider track width than the earlier trucks. However those trucks came from the factory with wheels with more back spacing than the earlier models. If you bought some cheap steel wheels with less back spacing you could gain a couple of inches of track width. You could add to that by installing some 1 - 2" wheel spacers for another 2 - 4" increase in track width. I've always liked the skinny tire look if the wheels are are pushed out to increase the stance. -- Matt

LTB
http://www.intercotire.com/tires.php?id=7&g=1

Narrow S.S.
http://www.intercotire.com/tires.php?id=8&g=1