I've measured current draw on my 2012 Lance 855S jacks. All 4 running the camper up will draw 32 amps at the battery. I checked each jack and the highest current draw was 8 amps. I replaced my fuses with 10 amp fuses. I want to KNOW when the current demand increases so I can fix why.
If you are blowing a 30 amp fuse on a single jack, you got a BIG problem. I can guarantee that the wires at my jack are NOT rated for 30 amps. (with the length of wire, 30amps should be a 10 gauge wire at 12vdc) You were lucky the fuse went and not the wiring burn up.
Think about it; if these jacks are fused at 30 amps each, multiply that by 4 and you would potentially draw 120 amps just to run the jacks before a fuse would blow. WOW!!
