At 67 years of age, I can no longer crank a manual trailer jack with any efficiency or quickness.  Even my young, husky and strong nephew wore himself out cranking my sailboat trailer up and down for launching.  After doing some research, I passed up a strongly recommended electric jack selling for just over $250 to purchase this one instead at $205 (and I've seen the same item priced in the $190 range on occasion).  While at a lower price, this unit comes with remarkably better features; stronger, well-lit (it has three LED lights on the head), bearings in the jack screw, very very easy installation (I was impressed with just how easy it was to install) with higher weight-bearing ability. I purchased an optional installation bracket (Universal Mount For Electric Trailer Tongue Jack) from Amazon.com.  Note this bracket is painted, as is the long straight neck of the sailboat trailer. I had to use a wire brush to scrape a little paint in order for the electrical connection to function properly. Note also the bracket is needed in this instance due to the fact a sailboat trailer does not come to an "A" at the coupling end, but is long and straight.  Installing the bracket is a 'bolt-on-and-forget' so no worries or issues there. One last thought.  If the electric feature is not working for some reason, using this jack in manual mode is not to be feared.  The crank handle inserts at the top and is turned horizontally, not vertically - so no bending over.  Did I mention I could turn it with one finger!  Unbelievable!  Ball bearings in the jack screw make this possible and I am absolutely DELIGHTED with my purchase...so much so in fact, that I bought two more:  one for my travel trailer and another for my daughter's 27' travel trailer.  I found a waterproof plastic bag in the camping section of Walmart (closes with a strong plastic buckle at the bottom open end) - that fits this jack perfectly and is very inexpensive.  I can't say enough about this jack (its easy install) or the bracket and cover.  Purchase with confidence.  John