We have a new Octane 161, and we had the dealer call Jayco to ask about this option specifically. Jayco said that it's not an option on the Super Lite trailers, but we have a workaround that we're building right now.
Given that one user here reported warping of the door just by driving their Harley up the ramp, I don't have a ton of confidence in the door's strength when used as a party deck with just cables. We're going to instead build something along the lines of this:
The idea is to build cushioned supports under the door to help spread the weight across the entire door. We're designing ours to also handle being deployed over a river bank or similar uneven ground. I'll post follow-up pictures when we're done.