Howdy!
I’ve been using a Reese GooseBox on my 2014 Cyclone 4000 now for a couple of years. I like it and would not go back to a 5er hitch. As mentioned the only draw back is the Gen Y has not been excepted by Lippert to not void your warranty. I like the Gen Y over the GooseBox because you don’t have to deal with airing up the hitch. Some have had problems losing air during travels, I was one of them. I would definitely consider the Gen y now as I’m out of warranty anyway.
You may want to look at the FaceBook “GooseBox owners group”. There are lot of folks using GooseBox and some with Gen Y that can help with truck and RV information.
“Happy Trails”
Chiefneon