From The Private Universe http://books.dreambook.com/tpu/probenews.html
"An official source has passed onto me some disppointing news...
The Sandcrawler vehicle, due for release in April/May '03, has been cancelled! It is unclear if this cancel is permenent or just till '04, the latter is considered more likely at this point.
You heard it here first. We'll be sure to keep you updated as and when we hear more."