In my professional opinion the damping requirements of a particular suspension system design has everything to do with its design characteristics and expected loading and very little to do with whatever "premium" means in trailer marketing.
I agree. The characteristics I want are well-controlled suspension action and smooth ride. With a leaf-spring axle, that requires the additional damping of shocks.
Fifth wheels have lower sprung weight vs a conventional trailer of the same mass. That in turn lowers the spring rates required to carry the remaining towed mass.
No, I don't think the sprung-to -unsprung ratio is a big deal, but even if it were unusually low spring rates would call for damping for control. I note that the springs (and therefore the spring rates) used in the commodity suspensions under fifth-wheels are exactly those used in the same suspensions under other trailers. The axle capacity determines the springs, regardless of the rest of the trailer... just as the current Escape 5.0 uses a normal Torflex the same as the 17' with the same axle capacity.
Close coupled axles don't react simultaneously but rather in sequence and symbiotically to road input. We don't anything about the designers assumptions regarding input amplitude and frequency. I've said before that if you only travel smooth roads you don't even need the springs.
Real tandem suspensions on real roads need springs and damping for acceptance behavior. If damping by interleaf friction is insufficient (as it typically is in packs of only four or five leaves) shocks are the solution. I thought we weren't designing a suspension here? ???
I'm sure if the chassis engineer determines the suspension system needs shocks it will get them, if it doesn't it won't be changing my mind regarding the quality of the escape product.
Reace is the chassis designer; I just asked if anyone knew his choice, and explained why I expected it might include shocks. I am not challenging Escape quality - I wouldn't be interested in the new trailer's equipment if I didn't respect Escape Trailer Industries and its product.
I now regret asking, as I would accept any answer - I would just add shocks if not factory-supplied. My question was also intended to benefit others who might soon be in a position to finalize option choices and might not be willing to add shocks themselves, but all the red herrings about tightly coupled suspension systems and unsprung weight probably killed any hope of clear understanding.
Is that why all the concern: is a simple question about components seen as a criticism of the design? It's not, it's just a question... like people asking what size of tires are supplied.