OK, had a quick look under the coach, while moving the sprinkler.
Looks like the worst part will be getting the springs off.
If the jack still operates, run part way down to stretch the springs , and put small wooden wedges in between as many coils as you can, retract the jack by prying up with a 2X4 under the plate. If the jack won't move , block under the plate, and put a large screwdriver 1/2 way through the end coil , pull down until you can get the end loop off the plate. Disconnect the sensor wiring and undo the hose at the top , take the two bolts out of each retainer on opposite sides of the jack.
Tools required , WD-40, 1/2 and 9/16 sockets and ratchet , 1/2 & 9/16 open end, needle nose pliers, and the large screwdriver and the wooden wedges & 2X4 if necessary.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.