Why It’s Important To Remove Snow From Trailer Roofs…

Photo courtesy of Ontario Tourism

Related: Other Trailering Safety Tips


Have you ever left your enclosed trailer parked for several days? Only to return to find it covered in snow? Here’s the reason you should remove it before driving away. Regardless of trailer size, snowmobile trailer roof snow overload can be dangerous…

Snow Covered Trailer Roof

Snowmobile trailer roof snow overload requires regular shovelling.

Photo by Dan Gould

One winter, we had a few small storms followed by a good 18-inch dumper. While hooking up the trailer, I became a bit concerned about all the snow on its roof. Snow could fly off while trailering to injure those in vehicles behind. Besides it’s illegal and could earn a magic ticket.

So we dutifully climbed onto the trailer roof and shovelled about two-feet of compiled snow from that 8×22-foot rolling aluminium shed. It was slick underneath that snow. A good inch of ice had formed from thawing and refreezing of earlier snow cover.

Snowmobile Trailer Roof Snow Overload

Broken axles due to snowmobile trailer roof snow overload

Photo by Dan Gould

While unloading at our destination, another four-place trailer arrived and parked next to us. Its owner complemented us for shovelling off the roof. He then went on to explain how he found out the hard way that it was a necessary chore. I figured he got ticketed.

Surprisingly, that would have been a wet kiss on the lips by Kate Upton compared to the major mechanical failure he suffered. It seems the excess weight of snow on his roof had overloaded the trailer’s maximum Gross Vehicle Weight Rating (GVWR) and snap went the axles. As unbelievable as that sounds, the math doesn’t lie…

Tow Capacity Before Snowmobile Trailer Roof Snow Overload

Using snow rake to avert snow overload

Photo provided by Paul McNichol

My dual-axle four-place snowmobile trailer has a Gross Vehicle Weight Rating (GVWR) of 7,000 lbs. (two axles at 3,500 lbs. each). Its dry weight is 2,500 lbs., fully equipped with options. That leaves a 4,500-lb payload capacity, which is more than enough. Check your trailer specs, as there are major variations of GVWR between makes and models.

I figure each sled, fully loaded with accessories, fuel, oil and filled trunk bag hit the scales at around 625 lbs. That’s according to published reports that actually weigh sleds. We’re talking 2,500 pounds of sleds. And that doesn’t even count all the snow stuck in the tunnel from the last ride.

Also, we typically throw our riding gear in the trailer during a trip. So I’d estimate about 25 lbs. per person, for another 100 lbs. In addition, we have tools, a few gallons of oil, spare carbides, and a 5-gallon gas can. Plus other odds and ends that easily total 250 big ones. Loaded for a road trip, my trailer has 1,650 lbs. of reserve capacity left. Excellent, we can take the baby elephant, too!

Snowmobile Trailer Roof Snow Overload – Extra Weight

Even a small covering can lead to snow overload

Photo provided by Paul McNichol

Snow consistency varies from fluff to wet cement. But most experts agree a cubic foot of settled snow weighs 15 lbs., on average. My shovel agrees. So if the area of the trailer roof is 187 sq. ft. that means a foot of snow adds an additional 2,805 lbs. of worthless ballast. Dangerous is a better term, as the trailer is now overweight by more than 1,000 pounds.

Now factor in that inch of ice, at 21lbs per square foot. That’s another 888 pounds. We are now overweight by the equivalent of one 1993 Mazda Miata!

Not only are the axles over the limit. But so are the tires and brakes. Hold on to that steaming cup of Joe. Why? Because you may have also unwittingly exceeded the towing capacity of your truck with the additional 3,700 pounds of ice and snow you are now schlepping around. To say nothing of even more weight if you’re also hauling a sled in the bed of your pick up.

Throw in whatever fudge factor you want. “My truck is underrated.” Or “My trailer is heavy duty.” But there’s no denying all that extra blubber you’re hauling on snow-covered roads in freezing temperatures.

Know Your Capacity To Prevent Snow Overload

Using snow rake from front to prevent snowmobile trailer roof snow overload

Photo provided by Paul McNichol

Now that I’ve scared the hell out of you, take a few minutes to read the specification label on your trailer. Figure out the GVWR of the axles, the dry weight of the trailer, and calculate the payload capacity. Be certain the tire load matches the GVWR by multiplying the maximum load written on the sidewall by the number of tires on the trailer. It should equal or exceed the GVWR. Check the tire pressure while you’re at it.

Regardless of the trailer type or size, you should do the math, and always remove snow from the top of the trailer. All told, it will tow easier, you’ll get better mileage, and it will be far safer going down the road. Plus, you may avoid a conflicting encounter with law enforcement and save a bundle on the axle replacement program.

Thanks to Dan Gould, Executive Director of the New Hampshire Snowmobile Association for permission to use his article.

Snowmobile Trailer Roof Snow Overload – Removal Tips

Loosening up ice layer with gloved fist inside helps prevent snowmobile trailer roof snow overload

Photo provided by Paul McNichol

  1. Always remove snow from trailer before driving.
  2. If you have a clamshell trailer, you may not be able to lift the lid until snow is removed.
  3. Metal and even plastic shovels & scrapers can dent or damage trailer skin.
  4. If your trailer is likely to be parked for any length of time, carry a snow rake, push broom & stepladder with you.
  5. Carry a shovel to remove any snow banks or drifts blocking the trailer in.
  6. Use snow rake & ladder to stay off the trailer roof & prevent damage or falls.
  7. Flex the aluminium skin of the trailer roof from the inside to loosen ice cover enough to sweep it off (From the inside, gently push against or lightly bang with the palm of your hand or side of your fist).
  8. While away snowmobiling, park your trailer where direct sun can help melt snow and angle it so the water can run off.

Thanks to Paul McNichol of Alumite Enterprises, distributor of Triton Trailers for assistance with this list.


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The tips and advice in this blog are the opinions of the author, may not work in every situation and are intended only for the convenience and interest of the reader, who has the personal responsibility to confirm the validity, accuracy and relevancy of this information prior to putting it to their own use.


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