I moved your Post to its own Thread as I suspect it is unrelated to where it was before.
You say you have a 2010 Montana which came with electric front jacks Probably supplied by Venture Manufacturing. They have a 30 amp inline fuse on a pink wire. You will need to find it and ensure it is not blown. Here is the Owners Manual for the Venture landing legs that may help. There are lots more Venture manuals available. Just ask if oyu need them.
lg owners manual.pdf
If you have replaced the electric jacks with the after market Level Up system, them there are bigger self-resetting circuit breakers used. If this is what you have, a different diagnostic approach is needed.