It looks like the door has a 2500# capacity, enough for the whole family, I would call or email Jayco giving them your VIN and ask if its possible. Your door may be built different than the newer models with the patios, it may not support the cable attachment point, better to contact Jayco.
Here is a link from Lippert for a patio hardware kit.
http://www.lci1.com/party-deck-ramp-door-patio