I bought these to help in the ad of lifting my tailgate of my trailer since the normal spring on the side of the trailer failed. The install was great and easy to follow and the system works really well. I bought 2 of these but after only installing 1 of them I figured installing the second one might be a little overkill as the single one works pretty good lifting the gate by its self with 2 fingers.
Only con that I could give this is that it should come with all the required hardware for 2 inch round railed tubing topped trailers and having to run to the hardware store for longer bolts was a pain but didn't impact the overall rating of the item in question.
If your thinking about it go for it, you won't be disappointed.