Our winnebago aspect has them and yes I still have blocks for under the legs since sometimes it depends on where you park, Soft tarmac. sand, muddy lot etc. I do level the rig with the blocks under the tires and then manually level the rig. They are quicker but unless parking on cement I would be very careful with them. Its no big deal to put a block under the appropriate leg/tire or even to pull them out and pack away when leaving.