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For lining a GN up they make a magnetic flag that you can place right next to your hitch ball. Then just line up your GN Hitch up to the side of the flag. In time you won't even need the flag.
As far as having to crawl into the bed to latch. Check with your local RV dealer. Most modern hitches have a remote cable that allows you to latch and unlatch the coupler without even crawling into the bed. We manufacture a heavy duty alternative to those and we use cables and small pulleys that route to the back of the neck right next to the jack handle/switch.
I may be full of BS (usually am) but I've always heard from the 5th wheel dealers that the 5th is the preferred tow hitch for travel trailers vs. the goose because the goose ball is lower and puts the side-to-side sway point two feet or so closer down to the ground and more in line with the axles. This means that on the goose everything above that line between the gooseball and the axles is subject to more side-to-side wind loading and sway. With the 5th being two feet higher it reduces the side-to-side wind loading because that line between the hitch and the axles is not as horizontal. This is particularly important in travel trailers because they are a bit more top heavy than most livestock and of course flatbed trailers. The gooseneck gets a stronger weight rating because it isn't limited by the geometric limitations of elevating the ball above the structure of the truck. I've lived in Wyo, SoDak, NoDak and Montana my whole life and I've never seen a 5'er TT blown over driving down the highway but I have seen plenty of bumper-hitches tipped over...although I'm sure it has probably happened. Again, I could be full of BS.
As far as having to crawl into the bed to latch. Check with your local RV dealer. Most modern hitches have a remote cable that allows you to latch and unlatch the coupler without even crawling into the bed. We manufacture a heavy duty alternative to those and we use cables and small pulleys that route to the back of the neck right next to the jack handle/switch.
I was thinking about doing a similar setup for mine, but was also thinking about using a 1/4 rod or similar and making a linkage setup, but as of now i still crawl in the bed.
When I bought my trailer they sold me a gooseneck adapter so I don't think voids any warranty since they installed it. The only reason I use a gooseneck is one I can pull other cattle trailers and If I break down one of my friends can come get me.
The other route to tow both 5th wheel and gooseneck is to go with a B&W turnover ball & companion (lots of $$ though) or get a gooseneck attachment that mounts to your rails. I know a few companies make them, and I've seen them and they seem to work slick. This would allow you to pull your camper trailer and also most other flatbed trailers.
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