Trailer Gaurdian Feedback

I'm creating a logo for a product called "Trailer Gaurdian". It's a special hitch attachment that prevents trailers or anything else being pulled to come loose. Here's my first draft for a logo for this product. I would love some feedback so I can perfect this for a website I will build later on. Also, what font would you recommend to portray a 'heavy duty' look, but isn't obvious (like the Impact font). Thanks in advance for anyone willing to lend a hand!