assembling a kar kaddy ss

I am looking to buy a kar kaddy ss tow dolly. There are not any for sale close to me in South Dakota. I see them on the internet but they are shipped unassembled. My question is has anybody ever put one together and how hard is it to do? When it arrives do you just need to put the wheels on connect the tongue or is everything in pieces. Like the brakes tie rods and such. Thanks for your help.