I've gone through a lot of trolling reels over the years...can't beat Shimano Tekota's for durability (size 300, 500 0r 700 depending on the application). Shimano TLD is OK too, but not as bullet-proof as the Tekota.
At a lower price point...Abu Garcia 6500 and 7000, or Penn 320GTi and Squall are pretty dependable with decent mechanicals and drags.
Frankly, I have a junk box full of Okuma's (Magda is absolute trash...Convector, and ColdWater not much better), and Daiwa's (which make some great spinning and baitcasters, but just can't seem to make a decent trolling reel) that last a season or two, but always breakdown at the most critical time.
As for rods...no need to spend a lot of money. Most trolling methods result in a reaction bite...the rod doesn't need to be sensitive. No need for high-modulus graphite. In fact, fibreglass or a blend with low-modulus graphite is preferable for durability. I do like the St. Croix line-up (the EyeCon series has some nice trolling sticks). At a lower price point, Fenwick and Rapala make some decent rods. Again, not a big Okuma fan with their rods either..the Korean's cheap out on the components and build quality.
As for leadcore, my favourite presentation for Shield lake trolling. Load your reel with 30lb. braid....then 3 colours of leadcore for Walleye OR 5 to 7 colours for Lake trout...then 50 ft of 10lb FluoroCarbon...then a stickbait...let out 300 ft total on the counter...make slow "S" turns trolling at 1.8 to 2.2 mph...