iffn you can match the rockwell gear ratio(6 whatever or 7 whatever) than with the tires all you need are
axle strength
gear ratio(if you can get the axles low enough)
stock duals
this is the setup my non computer buddy uses, with out a hich(sp).
i run dual toy's on a 22re with 38.5sx's and my bud's crawl(side to side crawl) ratio seems to be the same.
his setup is unstopable compared to the guys in our club that run 'cough' dana axles with 42's. now i don't run dana axles(diamond here) but he get's it without the dumbass breakedges.
unless you are worried about your tow rig not doing it's job, i'd say rocks.
i'll try to get my bud (club member) to post up but he used to be a heep guy