Manufacturer model length vs actual tongue-tail length

I had a 19 foot (22 total) trailer and just got a 26(almost 29) foot trailer. The first had more of a solid front, with just a slight upwards slope. The newer is very rounded slope, and although we only towed it home from the dealer, we were towing in to the wind, and still were able to keep the RPM's lower per speed than we were taking the shorter one in for the trade. I'm hoping I see that result on our first trip too.