Maybe not a sure thing. There have been others that have had their trailers upgraded to 8K axles and it was a bit too stiff. Shook the coach more than normal. Things came out of the door and drawers. While I too am a person who thinks more is better but I have to allow myself to trust in the engineering with these frames and axles. I feel they wouldn't build these if there were any chance of failure or injury. My 2-cents
Mark
We're the ones Mark is referring to, and I agree. There should be no need to move up to 8K axles/springs UNLESS you are too close to the 14,000lb total capacity of the 7K axles/springs. For us, Lippert thinking we were overloaded, when they saw flat springs, changed ours out to 8K springs. Problem was, we only had 12,900lbs on the 7K springs...we were actually UNDER by 1,100lbs. This "oversprung" us to the tune of 3,100lbs on the springs and after only 100 miles, it looked like a bomb went off in our coach...even broke the mirrored door off the entry closet!
We opted to keep the 8K springs and added the Center Point, which "tamed" our stiff springs and it now rides like it did previously...so we can't say just how smooth it would be with lighter springs...but at least I'm not worried about them flattening out again.
I really feel that the engineered suspension on these units is proper, however, they may have a problem with springs and I'm really leaning toward it being partially due to inferior metal, based on our experiences. I also feel that most people aren't aware and/or don't realize they need to check the axles/springs/hangers/tires, etc. on a regular basis. Especially for torgue, wear and WEIGHT...the best thing anyone can do for themselves is know your weights, and adjust when necessary.
And one more thing, on the axles, just don't check for total weight...know your individual tire weights and adjust leveling accordingly...many people don't realize one axle can be much heavier/lighter than the other. We were 500lbs heavier on back axle which could have caused major issues by overloading those tires/axles/springs, etc....adjusted pin height and now only 25lbs difference between the axles. Really feel this contributed to why our spring broke on rear axle not long after taking possession of the rig...live and learn!