Don,
We did the Trent Severn in our 43' Selene in 2017. You'll find more information on our blog,
start here. It's a wonderful trip, we'd do it again if we could get our draft down to 4 ft! At 5 ft, it's dicey in several sections, even though the controlling depth is purported to be 6 ft. We banged the bottom a few times out past Kirkfield, and the bottom isn't sand or mud like it is over here on the east coast, it's GRANITE!
We had the advantage of exceptionally high water levels on the way west, but the water levels returned to more normal levels (about 9" lower) so even skinnier!
Despite the anxious moments with the depth, the trip was one of the best. The pace is relaxed, the towns are wonderful, the people friendly, and the scenery spectacular.
We did a return trip retracing our steps, if you're ambitious, you can return down through Lake Erie and the Welland or the western section of the NY Canals. We encountered a number of loopers who blow through the Trent-Severn and miss a lot of it, it can be more than just a part of the loop trip, but the season is short and there's plenty of distance to cover, so there's a choice to be made regarding itinerary.
Your platform will be great for the Trent. Take advantage of the mooring permit, it's a good deal. The year we went, the lock fees were waived for the 150th, and the NY Canals fees were also waived, so we got a real bargain! We made a lot of stops at the locks, the parks are delightful, the staff always friendly, and locking is very low-stress.
Enjoy!