Just because of Where I live, I would not trust the Jacks alone... We live on an island in Alaska where winds are a frequent concern. The winds have overturned 25 ft boats on trailers, overturned a truck camper right out of the bed of the truck, pulling the side of the bed out of the truck (granted it was using bed-tie-downs). Where a few people here, have poured pads with tiedown eyes with pieces of chain into the slap, then lowered the camper onto a riser of some type, then tied the camper down to the chains to keep the wind from blowing over their camper. Just saying, don;t always trust the jacks alone.
Garry