I am not familiar with your coach or jack system but on typical Class A coaches a hydraulic jack system (which uses an electric motor to operate the hydraulic pump) is fed from the coach batteries on a 100 amp re-settable breaker, not a fuse. Also the parking brake must be on and the engine running when jacks are operated. So if your jack system is similar, I would be looking closer to the coach batteries (or perhaps the hydraulic pump) for a re-settable breaker that may be tripped, not in the typical fuse panel.
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