If kits are still available for older hydraulics then it is possible that it can be done.
I rebuilt old Happi-Jac hydraulics on on old '94 pop-up... those had square tube not the round like you show. I am not familiar with the brand/ model in the picture. Mine were easy to do but the solid round steel rod that extended and was very pitted one one. I emery-clothed it as best I could knowing it would scar the seals and begin to leak again. The rebuild did solve the leak for the duration of my owning that particular caper
Back when I did the rebuilds, the cost for four kits was about $60, not sure what they might be now if available. You might want to perhaps factor cost to buy, time to invest and the potential that existing condition might prohibit a rebuild. If the lift rod is severely pitted then it might be fruitless.