Oh to be sure, it's likely a 1947 Dodge could have indeed towed a boat, but at speeds of maybe 45-50 mph and you might not want to be behind it if you're in a hurry.
What's changed is really how fast everyone goes these days. For example, the speed limit on most LA freeways is 65 mph but as an Angeleno I'm here to say that's really just a suggestion because aside from rush hour NOBODY does 65 on any LA freeway...N-O-B-O-D-Y.
And once you cross something like Beach Blvd on the 405, everyone is doing AT LEAST 75 or even 80.
I'm serious, I've even watched cars pass CHP cruisers doing 15-20 over the limit and they don't even bother with it unless they're driving like a moron.
And a 1947 Dodge doing 75 or 80 just isn't happening, boat or no boat, at least not for more than a few miles.
The official top speed of those cars is 78 mph according to Automobile Catalog dot com.
And in 1947 that was perfectly okay because the typical speed limit on what used to be called "turnpikes" was 45 or 50 mph, with 60 being considered a rip-roaring pace.
Yes, the old lead sleds were bigger and heavier but while they may have had sufficient torque to do towing chores, they lack the horsepower to be practical on today's highways if they're pulling something.
I remember when a lot of people used cars to tow as well, but they were typically something like a Mercury Commuter station wagon, which usually boasted a 390 c.i. V8 with advertised power of 270 hp and 403 lb-ft of torque, and a handy 118 mph official top speed.
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I think what handicaps some of the smaller crossovers isn't the power, it's the fact that the body itself, which is UNIBODY instead of chassis on frame, cannot adequately deal with the stresses of towing anything more substantial than a small U-Haul trailer or a jet ski. The larger crossovers can handle a boat...MAYBE. Again, it's the lack of a proper frame and the smaller size.
You could tow a small boat, like a Boston Whaler but you're not going to be able to hook up to a cabin cruiser, today's crossovers are just too SMALL at any rate regardless of how much power they might have.
But what I was getting at is the fact that designers have basically begun to copy the general layout of the old lead sleds of the early 20th century, only in a
much smaller size.