Here's what my wholesale "book" says. I assumed "SLE" trim. I included all the things that could be added for extra value.

2002 GMC SIERRA 1500 EXT CAB SLE

DESCRIPTION
Engine Type: 4.8L V8
Body Style: 4 DOOR P/UP

Standard Features: ABS STD, AC STD, CD STD
DUAL FRONT AIR BAGS STD, POWER WINDOWS STD

Base Price: @ 43,000 miles $12,550
Mileage: 60,000 -2,125

ADDS & DEDUCTS

ADD: 4 WHEEL DRIVE + 3,100
ADD: 5.3L V8 + 450
ADD: DUAL POWER SEATS + 350
ADD: LONG BED (8') + 300
ADD: SPORTSIDE + 500

So if it has 4wd and nothing else, the current wholesale value is $13,525. If it has all the other options that brings it to $15,125 (in case you're wondering, all the other options mean nothing to the dealer).

Remember this is an average price of what a dealer would get in auction for this vehicle. If you are using it for towing or off-road stuff it might be worth it, but it will get crummy gas mileage. You'd be better finding something else if all you will be doing is commuting. My 0.02.

--pete

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2004 330xi, 2002 K1200RS