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... earlier parts of the discussion as being the type of trailer that would work well, as far as ride quality goes. It's also why the post you made the reply to only dealt with cheap kit trailers and "standard" trailers.
That would depend who you talk to so one might know what "drawbacks" you are even talking about. Since your reply is directly to me, maybe I need to clarify for you that I never said anything against trailers in general. None of the specific negative issues I've mentioned have anything to do with trailers as a whole, and all can be avoided by making different choices (except for the example of trying to turn around on a narrow dirt path, and except for the fact that a good trailer costs many times more than a good roof rack), so I think you might be looking to argue against a point that I never made.
Maybe you were talking about the loading-height issue? Well, it's true. If you have a canoe on your shoulders, it's a lot harder to squat way down to set one end on a low rack than it is to simply step out from beneath it after setting one end on a roof rack, especially if it's a heavy boat. Also, it's also a lot harder to roll it off your shoulders and into your hands to set on a low rack than to simply set one end on a roof rack. It's not that low-loading is THAT bad, but it is harder, so I only mentioned that in response to all the folks who think that low-loading is universally easier. That "universal truth" isn't the case for all kinds of boats.
IF you are carrying a canoe on your shoulders by yourself, and IF you've got a rack that you can lean the boat against (THAT issue is the only reason people keep asking questions about what should be an easy process), THEN there's nothing easier than simply stepping out from under the boat, followed by lifting less than half its weight using your hands (the initial overlap of boat onto rack means more than half of the weight will be taken by the rack when you pick up the other end, in case that needs to be explained to you, and the amount you lift becomes progressively less as you slide the boat onto the rack, too). Why would squatting down low, or dropping the whole canoe into your hands, be easier than simply walking out from underneath it?
Once again, I'm not saying it's a huge deal, but if you can't picture in your mind (since it appears yoiu haven't carried and loaded a canoe by yourself using this method) how simple it is to simply walk out from underneath your boat and then lift only a fraction of its weight, I don't know what else I can say.
Working in pairs, as Pete points out, loading onto a low rack is definitely easier, and in that case it's true even if there are no higher cross bars in the way, but this wasn't a discussion about two people cooperating to load a boat.
Okay, it's hardly worth saying more, but this idea that I'm so "unique" in finding the "step our from underneath" method so effortless can be refuted easily. You know those brackets that used to dot the north country canoe trails by the hundreds? The ones that people used as a means of easily resting while on the portage trail, or just to make it easier to get into and out from under the canoe? Well, how high were those racks? About three feet, or about seven feet? Well, there ya go. They made 'em that way to make it easier, not harder.
... at the risk of repeating myself, the discussion DID take off in the direction of advantages of trailers versus roof racks "in general", which is no sin because side discussions ARE permissible. Anyway, I'm sure canoes were mentioned somewhere along the line, and all I did, in side-discussion format, was to address the kind of blanket statement I've seen here before, that lower is always better. Hey, if you want to get picky about adhering to the original topic, most of the thread strayed off topic because the original question wasn't about effort at all. The original question was about feasibility, and with few supporting details. We did find out that the paddler is male, and he gave no indication that he's small or weak, and the car being used has a roof that's almost as low as they come. So, who inserted the idea that loading on the roof would be unnecessarily difficult?
Anyway, the poor OP never came back, and probably wouldn't paddle with any of us now.
I bought a 4x8 folding trailer from Harbor Freight for under $250.00. After adding a treated plywood bed, putting a hitch on my Equinox, trailer registration, wiring, etc, I have less than $500.00 into it. I mounted my car-top carrier (for the camping gear) to the bed and built a treated 2x4 rack to carry the boats. It's a heck of a lot easier to load the boats on the trailer than it is to lift them up onto the roof racks, especially after a long day of paddling. I can also tell you that a kayak will take a side view mirror off of a car like a guillotine if the wind catchs it before you get a strap on it. The boats and gear stay on the trailer (tarped) all season then everything, including the trailer, goes into the garage for the winter. I even have room for the bike rack on the back of the car, with the trailer attached. My friends tell me it looks like the Beverly Hillbillies going down the road but, I don't care. Turning around, parking, or increased tolls have not been an issue. It's definatly an option worth exploring.