I can vouch for trolling a Floating Rapala behind a 3 -way swivel with a weight or a bottom bouncer. This setup works very well. I did it for years to search for walleye concentrations. Once I found them I then went to jigging or lindy rigging a worm harness or leech floating spinner rig.

I have since gone to trolling deeper diving cranks and skimming the bottom to find where wally schools are. And I mostly now just slow troll my worm/leech floating  spinner harness rigs with a 1/2 oz to 3/4 oz Lindy Rig setup.  

I used to bring up a whole flat or 500 nightcrawlers to Quetico and did super on big walleye with Lindy rigged floating glow spinner harnesses. In fact, I used to outfish my counterparts who trolled shadraps, thundersticks, etc.  However, since the livebait ban, I have had to resort to GULP and my numbers and size seem to have fallen off at least 25%.  I am still trying to refine my Lindy rig setup to get back to the old days.

At the end of June Iam planning to try more hard plastic trolling to get walleyes. I have to thank some QJ members like  Jaximus, and Mastertangler who have given me lots of excellent advice on the art of trolling for walleyes ( and Lakers). Can't wait to go north.