The 18' Champlain was built for big paddlers. It will tolerate paddler weight differences better than a slimmer canoe. The suggestion for dual sliders is right on the money. Only way to get close with that big a difference. Putting the big paddler in the bow in hopes that it puts him closer to the midpoint of the hull and thus better trim is offset by the narrower bow vs stern. There is a lot more volume in the hull 4'front of the stern than there is 4'back from the bow. And in paddling posture body weight is centered forward of the seat, not on the seat.
If you were ordering a new hull you could talk to
Wenonah about putting the aluminum anchor plates into the next set of ribs in front of the usual spot. Then you could custom locate a rear slider farther front. And with a 300+pound paddler I would replace the stock cross-bar of the sliding seat frame with a stronger piece of aluminum. I have managed to crack two of them with big 250+pound paddlers. In addition to the heavy weight sitting on the bar, very large people tend to drop onto the seat and not ease onto it. The oval thwarts of a MichiCraft are one solution that has worked for over 10 years.
Hardshell Kayak Sail Rigs
URCHIN Portable Anchor
Reflective Hull Decals
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