Timberen has two options: Severe Service-Slide-In Camper Or Salt Spreader (single), 8,000lbs Standard, 8,600lbs (numbers not reversed). The Severe get stiffer very fast and contact even w...
I have the second one and love them!!!! Smooth ride empty and loaded I like that when empty im running on stock springs. To change my ride I just adjust my ranchos 9000 stiff or soft. I have put a few thousand miles on my timbren's and will never switch, truckers have been using them for years.