I have to admit, tho they are "cute" those little truck things never appealed to me really, neither did the mini 8th scales, or indeed the associated rc18b..
THIS
http://tamiyausa.com/product/item.php?product-id=56701
on the other hand, is a must have !!! looks ace, hope it goes as nice as it looks, who cares if its as quick or handles as well as an associated.