Yeah, a "free spooling" winch would help you unload a bit faster than you might be ready for.

I recently bought a winch from Harbor Freight that I haven' had the chance to check out yet. It has a wireless remote, so you wouldn't be limited by the wire of the remote control.
Here is a link to it, but I bought it on sale and it wasn't this much then:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=95912 I have one like you posted the link to and, even though it says "Free Spooling Clutch", mine will ease the item off just like it pulled it up on the trailer. Now, you CAN unlock the drum and pull the cable out. Check out the one I posted
Capacity Wireless Remote Controlled Portable Winch with Roller Fairlead
Camouflage 12 Volt 3000 Lb. Capacity Wireless Remote Controlled Portable Winch with Roller Fairlead
Remote control gives you safety and freedom of movement during vehicle recovery.
* 6 feet per minute @ 3000 lbs.
* Two button forward/reverse remote control
* Freespooling
* Drop-forged hook with safety retaining clip
* 7 gauge mounting plate is predrilled for installation
* 30 ft. of 3/16" zinc-plated high carbon steel cable
* Ideal size for SUVs, ATV or yard tractors
Overall dimensions: 8" L x 9" W x 7-1/2" H; Mounting plate dimensions: 8-7/8" x 4-7/8" x 5/8"
Weight: 18.9 lbs.
ITEM 95912-6VGA
$99.99