Highly recommend you get a hand grease gun (Walmart sells them). There are horror stories about the dolly's coming from the factory with barely any bearing grease. I have a heavy duty Master tow with surge brakes that I've been towing my jeep patriot around for two years and 20K + miles. recently put on new tires. It has worked flawlessly for me. However, my jeep was just totaled and I am going back to four down for the wifes sake. She cannot work the tie down ratchets.
Good Luck,
Rob