AFAIK: Waggy axle are not "full width". They are roughly the same as WT axles.
"Full Width" to me means 3/4 or 1 ton axles from a truck which are much wider and I personally don't like them. You could never get away with running them around here without getting pulled over by the police every couple of blocks.
Either swap in some WT (direct bolt in) or Waggy (quite a bit of work) axles and enjoy much better stability by the added track width.
BTW: a local guy has a kit for sale on another forum that I frequent for $150.