You could get a large electric tow truck winch. Be sure to have a couple extra 12 V batteries with you.
I'd also suggest using the heaviest fishing line you can find.... You know what? Scrap the fishing line and go with 24 strand towing cable... Attach a large meat hook from the butcher's store to the end and use about a pound to a pound and a half of rainbow sparkle power bait, molded around the meat hook.
Get a crane attachment for your truck so that you can get good distance on the cast... Or if you want to really get serious, get a 14th century catapult and really launch that bait across the pond.
There's no such thing as casting too far, so really get the catapult that suits your body of water...
You might like bobber fishing like I do, so get a large weather balloon and attach it 12-14 inches above the meat hook.
Tight lines... Send pix of your rig and monster whale trout when you get into em... And you will!!!