When I bought my roof rack the store said the 125lbs sunroof limit and the 200lbs non sunroof limit are the max loaded dynamic weight rating evenly distributed. That means you can drive with this amount of weight on your roof. It affects the total vehicle load rating and it’s handling characteristics. The glass and all the motors and mechanisms must weigh 75lbs that is taken away from the roof top load rating. Adding a higher CG. Manufacturers don’t want a top heavy vehicle rolling over and getting sued. I asked how people use the roof top tents. If they can only hold that much weight. They said that is a static load or non moving load. They said most manufacturers do not list the static load limits. That is why they offer the HD load bars to support the weight of people on the roof inside their tents. RTT can weigh anywhere from 100lbs to 200+lbs depending on brand and model. This may bust your dynamic load rating so you need to be mindful what’s on your roof. But they said if I had the HD bars (200 lbs.) and a 200lbs rated RTT I could put 400lbs of people and gear in the tent evenly distributed. I can tell you from experience that the factory crossbars are very flimsy. My rack had a lot of movement and vibration with the factory crossbars. I installed the HD bars and it’s solid as a rock now. When my roof is loaded with two boxes of tools, Maxtraxs, awning, lights, brackets and the weight of the platform itself. I am around 200lbs. No problems in a year of use.
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