What makes up a GVWR rating?
I am wondering what it is in the design of a trailer's frame and suspension or otherwise that gives it a particular GVWR rating. Is it the axles primarily? We have a trailer with a GVWR of 6800 lb...
Forum Discussion
Yes the GVWR is limited by many things, including the frame strength, axle weight ratings, hitch capacity, ball size, and other things to much to list.
It seems that your frame is design critical at about 6,000 pounds, with spring hangers not rated for much more than that weight. The frame should not show stress cracks until well into 80,000 miles and 10+ years of service, even then cracks are not "Normal" but a sign that perhaps the steel is a little to thin for the weight applied to the chassis.
So my guess from the information provided is the manufacture put a trailer to heavy on the frame that is to lightweight. Strengthening the frame might help, but in reality, a stronger frame with thicker steel walls, and more weight capacity on the axles, spring mounts, springs, brakes, hitch mount, ect. all lead to a larger weight capable trailer frame.
So the limiting factors? I have not seen a 2" ball mount rated over 5,000 pounds capacity. Beyond that weight, they go to a 2-5/16" ball mount, rated upwards of 13,000 pounds - that I have seen for sale, I hear they go higher though.
Axle weight rating. Say you have a 4,000 pound axle weight rating, and one axle, the GVWR might be as high as 4,500 or 4,800 pounds, with the remaining weight on the hitch, however a more conservative manufacture would place a GVWR within 350 pounds of that 4,000 pound axle weight rating. If a higher weight was required, they would be prudent to increase the number of axles, or increase the GAWR. With 2 axles, rated at say 3,500 pounds each, then a 7,000 to 7,500 GVWR can be built on that chassis, depending of course on the frame thickness, height, and construction.
There are 13,000 pound GVWR trailers with proper frame construction, and a pair of 6,000 GAWR axles under it. The manufacture relies on the hitch weight of 1,000 pounds to balance things out.
Anyway it seems like you need to take everything you put into the trailer out, and take it to a scale. If the trailer is significantly over the manufactures GVW empty, as advertized, and you can not safely add 800 pounds of camping stuff to it, take it back to the dealer, and let them deal with the lemon laws, and facts that you can not use it safely.
If you start to modify the frame, then the manufacture can cancel any remaining frame warranty due to un-authorized repairs and modifications.
Fred.
Fred.
It seems that your frame is design critical at about 6,000 pounds, with spring hangers not rated for much more than that weight. The frame should not show stress cracks until well into 80,000 miles and 10+ years of service, even then cracks are not "Normal" but a sign that perhaps the steel is a little to thin for the weight applied to the chassis.
So my guess from the information provided is the manufacture put a trailer to heavy on the frame that is to lightweight. Strengthening the frame might help, but in reality, a stronger frame with thicker steel walls, and more weight capacity on the axles, spring mounts, springs, brakes, hitch mount, ect. all lead to a larger weight capable trailer frame.
So the limiting factors? I have not seen a 2" ball mount rated over 5,000 pounds capacity. Beyond that weight, they go to a 2-5/16" ball mount, rated upwards of 13,000 pounds - that I have seen for sale, I hear they go higher though.
Axle weight rating. Say you have a 4,000 pound axle weight rating, and one axle, the GVWR might be as high as 4,500 or 4,800 pounds, with the remaining weight on the hitch, however a more conservative manufacture would place a GVWR within 350 pounds of that 4,000 pound axle weight rating. If a higher weight was required, they would be prudent to increase the number of axles, or increase the GAWR. With 2 axles, rated at say 3,500 pounds each, then a 7,000 to 7,500 GVWR can be built on that chassis, depending of course on the frame thickness, height, and construction.
There are 13,000 pound GVWR trailers with proper frame construction, and a pair of 6,000 GAWR axles under it. The manufacture relies on the hitch weight of 1,000 pounds to balance things out.
Anyway it seems like you need to take everything you put into the trailer out, and take it to a scale. If the trailer is significantly over the manufactures GVW empty, as advertized, and you can not safely add 800 pounds of camping stuff to it, take it back to the dealer, and let them deal with the lemon laws, and facts that you can not use it safely.
If you start to modify the frame, then the manufacture can cancel any remaining frame warranty due to un-authorized repairs and modifications.
Fred.
Fred.
