I bought the Harbor Freight one and installed it, and immediately took it off and returned it. Very poorly made, very slow, and sounded like an unlubercated bucket of bolts. Made so that water could get into it very easily.
The very cheap electric RV jacks are not going to be satisfactory. Stay with a Barker, Bull Dog, or Atwood or you will be replacing it again soon.
Pre lube the bolts which hold the jack in place for several days with something like PB blaster. Spray it on both the top and bottom of the bolt up inside the tongue coupler. The bolts used are a fine thread variety, and after years of exposure they get very rusty and can be hard to remove, and you do not want to break one off.