I'd say I can hold my own at backing a trailer. Whether it's a bumper pull, 5er camper, or goose neck machine trailer. BUT, the hardest to back of all these, to me, was the 5er. It seemed like the axles were, maybe, a little farther forward. Like, maybe to keep a little less weight on the pickup.
I say this, because I could back a 24' goose neck with a 2 ton dumptruck with a backhoe on it, 1/2 mile down a skinny dirt road at night just pretty darn quick. My brother was on the tail of the trailer shining a flashlight on the ground. We'd gotten bad directions to an oil drilling site.
I had 3 5ers, they were definately harder to back. The class c was a piece of cake as is the class a. I drive, part time, a charter/tour bus. They're 45' long and 108" wide (mirror to mirror).