HP Velotechnik makes a dual suspension line of recumbents .. HP Velotechnik - Main page (recumbent)
NB: http://www.hpvelotechnik.com/produkt...t/index_e.html

Many recumbents are simpler and have no suspension , so the jolt is still potential..

there is the Suspension seat post approach , Cane Creek Thud buster has a variety of elastomer density pieces

lie to it about your weight on the saddle and a softer one can move more when you have a surprise bump..

bumps you can anticipate , get off the saddle, your legs will cushion those..





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