Welcome to the forum!!
Owners manual, if you can find one will not likely have any equipment specific operarting information. You will need to know the manufacturer and and model number and download the manual. Photos of the jacks and associated controller would help? Are they hydraulic or electric? If not, take a photo and visit the different jack manufacturers web site to try and find a match.
2020 Montana 3780RL fifth wheel (41 ft) / 2016 F-350 6.7L diesel crew cab long bed 4x2 DRW
2022 Thor Palazzo 33.6 diesel pusher / 2021 Chevy Equinox LT AWD toad