My trailer was originally built to move a Superbird around, and I opted out of E track. I'd bet it is convenient. One thing you need to remember is that you cannot simply figure that your car may be 3500 lbs, and that this is all you need. During braking, (esp. a panic stop) that weight is multiplied several times. This is where the higher the weight rating...the safer your tie-down. As an aside...I remember a few years ago, a friend of mine's Charger was being towed to the event, by the guy that restored it. His tow vehicle struck the rear of a semi, breaking off the trailer hitch, and driving the trailer into the towing vehicle. Worse yet...the Charger's tie-downs gave way and the Charger went through the front of the trailer. The fenders were driven into the doors...the doors against the quarters...even the cowl at the base of the windshield was buckled. Sad story indeed.