The spare tire covers that I recommend are the Universal Spare Tire Cover for 26-3/4" to 29-3/4" Diameter Tires # 052963753479. This cover comes with 1 cover, so you will need to order 2 of them.
This cover is made of a vinyl material that is resistant to water and also designed to block UV rays. It is also confirmed to fit both your 205/75r14 and 205/75r15 tires. view full answer...
Based on your explanation, I think the Fastway e2 Weight Distribution w/ 2-Point Sway Control # FA94-00-1000 will be large a system for your application giving you too stiff a ride. The light tongue weight of your trailer will obviously be slightly increased when you load the trailer, but the dirt bikes in the truck bed will only add a portion of that 500 lbs to your total tongue weight as only cargo weight behind the rear axle gets added to the total tongue weight for your weight distribution... view full answer...
I am happy to inform you that the Adco SFS AquaShed, part # 290-52239, is confirmed to fit your 2018 Jayco Jay Feather 16XRB.
As for where the access zipper are, there are two located near the rear on the passenger side (where your door would be). The panels would roll up from the bottom and can be secured to leave access. I've linked to a video review of the Adco covers. You can see the setup at the 0:46 mark. view full answer...
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