Avoid the telescopic models because stiff heavy action telescopic models generally overmatch the fish. As for lines,use premium grade two to four pound monofilliment for spin or spincast outfits. For fly fishing, stay with your floating fly lineand an assortment of light tippets. As for your baits, artificial or real bait is your choice. For that type bait salmon eggs are best, but I have used velveeta cheese and Zekes' floating bait often.
Mini marshmallows work excellent are are easy to pack also.
For natural baits that will attract the trout because this is what comes from their environment, try grubs,ants,crickets,or beetles. As for artificial baits, try a simple Colorado spinner. A backpacker or camper never leaves home without his fishing gear or lures,that is almost an unwritten law. The back country can offer some of the most sensational fishing and large trout you have ever experienced. Anyone that is willing to make the treck to the higher altitudes will be amazed at what the higer elevation lakes has to offer.