Update - EZ Rec Rack system
https://www.ezrecreationalracks.com/I've kept searching the interwebs and found a potential solution, at least for freshwater use. Would still require fitness level that would allow a single user to lift at least 50% of the weight, but fulcrum effect means you wouldn't have to lift it far or handle the weight too long. It was really designed more for loading fishing kayaks, but appears like it could handle a TI, maybe with slight modification. Anyway, this is my plan - find a relatively recent model year and not-too-far away used TI, and buy one of these for my SUV. Cheaper than a trailer, but more importantly, would allow us to bring our teardrop trailer and still take the TI.