Caught a 34" musky in loon last summer on top water fishing for bass. Haven't seen or heard anything on musky this year.
It used to be a good musky lake but it is no longer. There were many years Loon went unstocked leaving only a few big fish. Those guys were thumped or died. There was one stocking several years ago but not enough to make it close to what it was. There are musky in there for sure but not many. It is a good bass/pike lake.
I'm not a Muskie guy so can't comment on your odds, I know I have never caught one there. Have caught plenty of Northern Pike on big top waters, spoons etc so I would have thought I would have bumped into one accidentally if they were plentiful.
As for limit on boat size, only the funky launch ramp on West Loon - if your boat/trailer can handle a fairly small and shallow launch...
Fished East and West Loon this morning from 5 to about 9. Very slow. Water high (no wake) although the launch on West is in pretty good shape. Buddy caught three decent LM on a surface bait and Senkos. I only got one. Here are the two best he caught.