On our ten days of travel coming home from picking up our trailer at the nest, I became increasingly annoyed at how hard it is to crank down the stabilizers, especially if a some lift is needed to level the galley. So I stopped at an auto parts place somewhere (Kansas I think) and picked up a tub of grease. I smeared a bunch on the already pretty greasy screws and while it seemed to help a bit, I feel it was still too hard to crank.
So home in my shop I decided to see what's up. I disassembled the jacks and found this:
Clearly there is a lack of lubrication where the arms meet the foot and the brackets at the top. This wear is after only a few operations of the jacks. I found that the bolts were much tighter than they need to be, they are not going to come apart as they are locking nuts. A lot of the friction was eliminated by simply loosening the nuts a little (it takes a 17mm wrench).
I added some grease to the friction points and reassembled, leaving the nuts about 1/4 turn from full tight.
The operation is greatly improved.
Another note about lubricating the screw. Even before I added a lot of unnecessary grease to my jacks (lying in the dirt in a campground) They were pretty greasy already, along the entire length of the screw. While working on my jacks I observe that most of the screw is unused and so any grease on the unused part is only adding to the mess. My suggestion for greasing the screw: Crank down the stabilizer jack to raise one side of the trailer as high as you can imagine would be the maximum you would use. Put grease on the parts of the screw sticking out of the back of the jack and between the drive nut and the front of the jack:
You can use a rag or paper towel to clean all the grease you can from the part of the screw in the middle of the jack, this part will never be used. Raise that jack all the way back up and clean up any extra grease that squishes out at the ends. Now repeat on the other side. Do not jack both sides up at the same time.
One final irritation was the crank that Camp Inn supplied. It is too long to store anywhere that is easy to access when you need it most, and the crank has a bit too little leverage, even with my newly lubricated jacks. So, I assembled a set of parts to use: a 12" long 3/8" square drive extension, an 8" long 3/8" drive "T" handle, and a deep 3/4" six-point socket.
These can be used to crank the jacks up and down, the T handle can slide to provide more leverage, and it comes apart in small enough pieces to fit in my little front storage compartment (I have the furnace so this is quite small) along with wheel chocks, hitch lock, and several other things.
I hope this information is useful to some of you.