Well… the title of the post is “…for heavier boats”. The first boat mentioned in the thread was by PaddleDog52 when he said his Libra XT tandem weighs 100 lbs. bud16415 said his canoe weighs 80 lbs. My recently acquired Northstar tandem weighs somewhere between 80 and 90 lbs. (depending on which website you believe.) I have a long list of tandems that I am tracking prices on (38 different models) 11 models are 75 lbs. or less, the others range up to 110 lbs. Even some single person recreational kayaks weigh more than 75 lbs. The Wilderness Systems Ride 135 for example weighs 82 lbs.
I do not know the weight of the OP kayak, so I posted the weight limit as general information, since I had briefly considered the hullavator and noted the limit.