Based on the dry weight and GVWR of your 2016 Jayco Jayfeather 20XTG the Equal-i-zer part # EQ37060ET would be your best option as it's widely considered to be the best system out there and has a tongue weight range of 200-600 lbs.
The Fastway kit part # FA94-00-0800 would probably work too as it has a range of 400-800 but it wouldn't be quite as effective. view full answer...
For your 2017 Jayco 16XRB travel trailer I recommend the Adco SFS AquaShed Cover for Travel Trailer - Up to 20' Long - Gray Item # 290-52240. This cover works for wind, rain, snow, sun, and long time storage. The cover is designed for trailers that are 18 to 20 feet long. view full answer...
A 2 inch hitch ball is not recommended for the 17222 system you referenced as even thought the hitch ball # A-90 will fit, the bars are far too strong for that trailer and will give you a rough ride.
For a system designed for that weight, I recommend the Fastway e2 # FA94-00-0600 with that same hitch ball. This will better fit the total tongue weight range of the trailer and any cargo behind the rear axle of the tow vehicle. I've attached some videos and an article to assist. view full answer...