I agree with Ross. A disc drag large arbour reel is a nice thng to have.
The secret is finding such large trout. If your reservoir has rearing cages I would tend to head for them using a fly that looks like a pellet or fish guts.
Fish as close to the cages as possible. If the cages are full of fish, there will always be fatalities and the dead fish will be ripped to pieces by the others and some of the flesh and guts will get into the water on the outsides of the cages.
I have known some enormous rainbows and browns to patrol near to these cages.
If you have no cages then fish deep near to dam walls early season. Into the wind too. If you have half a gale blowing into the dam wall, fish a booby on a short leader. The undertow will often pull your line out. Pay it out and then let it sit for periods of time until you get a take.
This sort of fishing suits those who like to put their rod on a pod with the buzzers turned on. And whilst you are about it you can use two rods with a different coloured boobies on each.
Take along your bedchair and go to sleep. A few cans of lager and some Vindaloo to warm up will be nice on a cold day.
Oh shut up Clay, you'll be getting the likes of Frothey and Cakey into trout fishing if you're not careful!!