There are a lot of advantages to a long tongue in terms of handling (forward and backwards) and sway -- The disadvantages come in overall length problems, parking, site fit, city driving, etc.
I often wonder why they are so common in states like Calif, WA, OR and ID and not often seen Back East -- I have no idea of the Canadian distribution.
BTW, as pointed out to me in a PM, we have been talking about tongue length without defining it -- I personally view it as the coupler to axle
length, but it's also correct to view it as coupler to Center of Mass (usually somewhat forward of the axle) -- Some may view it as coupler to trailer body, but that's not good for much, IMHO, in terms of handling, proportions, etc.
Overhang is the ball to TV rear axle
, which is very short on 5W/goose-neck hitches and why they function so well.
PS I remember from my days in a former life living in Florida (Tampa area) that one did NOT mess around with gravel trucks on the road -- They were always in a hurry, trying to get in one more payload during the workday and carried a lot of mass, even when empty -- People would pull out in front of them and get seriously hurt! Doubly true when pulling a trailer, of course!
The Northern reaches of Dale Mabry highway, where there was a lot of traffic on the then two-lane parts was esp dangerous in late afternoon, with tired truck drivers trying get one more load down from further North and Moms picking up the kids after school.