I've been pondering the same issue, thinking about getting my first RIB this winter. Over here in the states I havenít found any for charter, so it's hard to get a real feel for the ride of different sized boats out in the open waters. I've been on a lot of mini-ribs that were dinks to larger power or sail charters, but that was all in flat water.
Locally, Southern California has no protected waterways and everything is quite spread out, so it's a lot of miles in open water to some of the local islands or up the coast. Other than the Ullman seats which some mentioned, (seem a bit expensive and not in production for pleasure craft?), there are a number of companies that advertise suspension seats for flat bottom fishing boats, workboats, and even long haul trucks. I have no idea how to compare a flat bottom bass boat hitting large boat wakes to a deep-V or hysucat running on open ocean swells, but would think it would be a place to start. I haven't heard of anyone who's experimented with any of them. Anyone try any of these? Know of any reviews? Any other products out there? Could/would you put one of these suspensions on a jockey?
One other question, while we are talking seats and boat layout. In the world or high performance sailboats, the rule it keep the weight out of the ends. One, I'm suprised I havenít seen more inboards that are located at the CG, instead of the back. Also a local dealer I talked to installs the fuel tank under the rear seats, and often I've seen rib's with the helm all the way at the back. Is that purely for ride comfort, or what are the rules for weight distribution for RIBs? Since most are stuck with the outboard hanging off the back, what does that say about placement of batteries, tankage, and people? Forward for to balance the outboard? Center/CG ? Since I'm contemplating the Stealth Hysucat 8m, I'm a little more concerned about weight distribution than most, perhaps.
Thanks for you indulgence with my novice questions. -- Mark