[BiggarView]

The weight added sounds about right. Did you add spacers to raise the trailer so sit would be level while towing? That will add another 200 lbs. We added the 8K IS system and raised the rig frame 2 inches which added about 850 lbs to the trailer weight. The overall height actually was lowered by 1" as the rear of the trailer was raised not the front.

ON the scales, the weight gain will show up that way, however its all under the frame so in theory your CCC numbers will not change. The rating are based on the weakest links of your tires and or suspension or barring that... frame design. By adding weight from the IS you should consider the load ratings of your tires as they are likely the weak link now. G rated tires run around 4000 lbs at 110 PSI that should be sufficient, but it will not hurt to go up to H rated tires but then you might have to get new rims as these tires are 17.5 inches vs 16 inches for the G rated tires of the same approximate tire diameter. FWIW