Car dolly's what to look for?

I have a demco car katty and have pulled it for over 70 thousand miles and in every state. I pulled it with 2 different motor homes and with 2 different cars. It has been painted twice, new fenders, new lights and a complete re wire. It has surge brakes and have never had any problems with getting hot or backing up. You can't back far anyway just like 4 down you can reposition at the pumps with ease. Now I did weld a piece of 2 in angle iron on top of the bump stop as with the last car 16 in wheels I saw it could be a problem. In 12 years of use I've only had to unhook maybe 8 or 9 times as always ask for a pull through. Learn how to use your straps correctly and your good to go.