Been to Kississing a number of times and had some great fishing experiences. I know there is a landing on the east side. Not exactly Thompson but halfway close. Awesome fishery! Unbeleivable trophy northern and walleye numbers. Largest walleye we’ve caught was only around the upper 20’s, but you can reel in 40″ northerns until your arms cant take it anymore on the right part of the lake. I think you will probably do fine no matter what lake you hit up there.
That is one heck of a drive. Its been a few years since I have been up that direction hauling boats so things may changed but I know we always hauled along a number of 5 gallon gas containers (anywhere from 3-5 per truck) that we filled up after we crossed the border. That far north is not a good place to run out of gas, plus the gas was quite a bit cheaper down south. Probably more so now.
I’d get a lake map of where ever you fish up there too. Rocks seem to pop up out of nowhere and eat lower units like its their job if your not careful.