The way in which you have described installation of the spring bars is very common. To determine if the Stromberg Carlson Electric Trailer Jack # JET-5000 has enough capacity to lift the trailer and truck (when coupled together) you will need to look at how much tongue weight is at the hitch when the truck and trailer are loaded and ready to tow. I have linked an article on determining tongue weight for you that should help.
Basically if the tongue weight is under 5,000 pounds then the... view full answer...
Probably but you will want to consult the vehicle owners manual to determine the capacity of your 2004 Mercury Mountaineer. Provided the gross weight of the Chevy S10 and tow dolly is under the capacity the Mountaineer can pull it. Based on what I saw at the very least it is rated for 3,125 pounds. Consult the owners manual to confirm. view full answer...