i put a ball on my van for my boat and it seemed fine,no safty chains.....i got a ad on my windshied of my van bimini top 129.95 so i called the guy , drove over to his house with boat. he made me top bow cover like $275 everything, i was happy fla sun killer plus i never had to tow more than a mile, so on the way home i got about 2 miles from home, i went over the railroad tracks and i throught the truck had more power, so i looked in my mirror and boat was detached and moving at a rate on 15mph. i sped up slammed on the brakes and ran to the boat and tryed to slow it down by hand running along side it....2 way traffic well i got it to stop after it did damage to a manhole of the citys ans broke tounge crank off the ball bolt came off. dont know how but maybe the guy who did my top borrowed it when it was in the top shop because being a mecanic i always tighten things up...still no safty chains, if i have safty chains...luckey no one got hurt no major damaGE to boat...but I WILL NEVER FORGET THIS, CANT BE TOO MUCH DUMBER, BUT I WAS 21YRS OLD .<br />P/S I WILL NEVER FORGET PLUG FOR BOAT NEVER