LOL, too many mods, only so much time here where I have family with shops and equipment to help.
I believe one of our problems since day one with our FL has been not enough Pin Weight for our GMC 3500HD.
Not putting enough weight on the trucks overload springs, if it was another brand, it would go ahead and squat right on down on them.
Our previous 5th Wheel had about 3,800 lbs. pin weight and no problems traveling coast to coast when entering or exiting bridges and ramps with uneven approaches or exits.
On our current Redwood 38FL and only about 3,000 lbs. pin weight the truck does quite a bounce I believe from coming off the overload springs and then bouncing back down on them.
The mod I am trying it a shackle lowering kit that lowered the truck about 1 1/2" and puts me right at the overloads.
I saw this mod done at the Rally we were at in NC during Memorial Day week on a 2012 Chevy 3500HD with a 5th Wheel that had a lighter Pin Weight and the guy loved the mod.
Installed the shackles last week, truck seems to ride the same without the 5er.
Sits more level too, still a little up in the back but much easer to get to the bed.
I will know more tomorrow when we hitch up our FL and head down I-10 & I-75 to Sarasota FL (about 300 miles)
The installation was a bit of a challenge due to tight clearances but me and my BIL got them in, sure hope it works out, do not want to put the old ones back on
(I saved the old shackles in case this mod does not work)