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Hey Scott, yes each of the ends of the dual ramp springs like the part #M346FR that you referenced turn independently. How heavy is your tailgate?

Hello Darrin, thanks for reaching out. For your 56" wide door what I recommend is the Conventional Ramp Door Spring #362SA5. This is made for the 56" wide doors, and the 85 lb capacity will make opening and closing the rood much easier.…

The spring with the black cable drum should always be mounted to your LEFT, standing on the inside of the trailer looking out. This is very important for proper operation. Dual spring systems, like #ERS160D96, have a red-coned and a black-coned…

To test the weight of your ramp door, you will want to get the door all the way down to the ground and then on a scale of some kind (a bathroom scale can be used for this if it's the only thing available). This will be when the door is at its…

To determine the correct weight springs you will need a scale to determine how much weight is on the door when it lays out on the ground. You will place the scale on the ground in the center of the landing path of the door edge. This will tell you…

I'd go with a double spring personally, Scott. These are typically going to be used on more heavy duty applications like your enclosed trailer with a pretty heavy door. In order to get a proper replacement though, you'd need measure the width…

Your broken spring should be color coded to indict the weight rating of it. It'll be spray painted on the roller or the spring itself. I've listed the colors and their respective weights below; White: 10/110/210 LBS Green: 20/120/220 LBS…

I called my contacts at our winch suppliers to see if there were any winches available that perform as you requested. I was unable to find a winch that had an auto shutoff when the winch senses a trailer door is closed since winches constantly feel…

For a 200 lb trailer ramp door we have the Conventional Ramp Door Spring part #362SA8HD which would work great as it has a 230 lb capacity. You'd need to have a professional wind it for you but it would easily work great for a 200 lb trailer ramp…

When selecting ramp springs for a trailer ramp, you will want to know the diameter of your hinge pin and how much space you have available in the hinge. A typical horse trailer or utility trailer ramp uses 3/4 inch hinge pins and would require two…

Jared, the 150" long cables that come with the Conventional Ramp Door Spring for 8' Wide Enclosed Trailer #M354FR are unfortunately the only size offered with that part. What you could do instead, is buy the Replacement Cables for…

You won't need to obtain the weight of the entire door, just the un-hinged side. You'll want to find the amount of weight you'll need to overcome to easily lift the door. You could use an old bathroom scale, place some blocking on it, and…