Ivan Vegvary wrote:

Need to dig out crawl space. Approximately 30' by 50' area. At present it
is about 4" deep. Want to dig down to 42"...

Like, 30x50x42/12 = 5250 cubic feet of soil?

... I need clever ideas on how to drag the dirt out.

How about a 5-gallon bucket (about 8000 trips) hanging from
a roller attached to a movable overhead rail?

A friend of mine deepened his crawlspace with dynamite.

You might try a shaped charge :-)

Nick