Easy stuff, 10 minutes or less and most of that is spent tightening 4 lock nuts. The companion separates into two pieces (base and head unit) for ease of handling by 1 person.How hard is it to change over or how much extra is the adapter.
Most, if not all, 5th wheel manufactureres will void their warranty if you pull with a goose neck to 5th wheel adaptor. The reason is simple; 5th wheel frames are not designed for the extra "bending moment" introduced by adding an approximately 14" lever to the pin box. Towing this way can, and probably ultimately will, cause delamination and cracking of the upper frame area, especially if you tow over rough roads or experience a lot of chucking during towing. Even if your trailer is out of warranty, there's no sense in ruining a perfectly good frame. When I was looking for a used 5th wheel trailer, I found several "bargain" trailers that had been towed using a gn adaptor and the entire upper frame was severely delaminated on all of them. I see people towing this way but I wouldn't do it on a bet. You might get away with it on a very light trailer or one that's towed infrequently over smooth roads, but why take the chance?I've got the B&W but I put an adapter onto my 5er instead of buying the companion hitch. I did it at the time because I was pulling with a shortbed, but I would do it again in a heartbeat. I can change my hitch height if I change trucks and I don't have to mess with anything except the ball.