personally, on a vehicle that old, I wouldn't even bother trading it in. they are not going to give you squat for a trade. typically you can expect somewhere south of trade in if you have negotiated a decent price on the vehicle. up here, the dealers are not using nada/kbb anymore but are using auction values since the majority of trades go that direction. my experience has been that any vehicle priced under $4k moves very quickly on craigslist. yes, it does take some effort vs handing a dealer the keys, but it's also MUCH easier to walk with no trade on the table and expect a call back not to mention it doesn't muddy the water allowing the dealer to play shell games with both prices.. now if it's a more expensive car sometimes you are better off to trade as you only pay tax on the difference, but probably not in this case on a decade+ old suburban.

if you have negotiated the best price on the rig, would you rather have $1k as a trade or 2k in your pocket and have made another family happy that needs a rig?