Greets; With stock oem coils, and springs, and fresh name brand shocks.., the XJ drove a bit more smoothly, albeit a bit harshly when sort of bottoming out in ruts, potholes, etc., on over the hill dead leafs from 190k miles, etc. The oem front coils seemed to be ok for their purpose. However the oem coils when compared to the Old Man Emu coil replacements were shorter. With the taller aka stock type coils by OME over the oem's, and the OME replacement higher arched leafs, and their top of the line shocks, and similar steering damper, and other important front linkage/bars/bushings/brace/bull bumper w/winch, etc., the ride now is superior in the sense that everything is really tight. The OME ride is harsher than worn out oem, but again sturdy, or a much more solid feeling. Hitting a lot of pot holes, washboard roads, makes for some body parts to vibrate. XJ seats, are ok and seem to minimize spinal compactions, LOL! Anyway, whatever shock system, and fresh suspension parts you get will all have a 'half-life' anyways. So, new soft rides, medium, or hard suspension system(s) will naturally feel very different, and adjusting to the newness will last only for so long before they tire, or one retires them for another setup requiring different suspension components. (I gave away my entire practically new shocks with 2k miles to someone in need). Certainly the idea already given you suggesting that that extra weight can help some systems is true enough. Your ride may calm down somewhat with that added weight, but it probably won't drive like a Caddy. I prefer the ride where the wheels want to stay glued to the road surfaces, and I can get a better feel of the XJ's punishment being received, rather than going sproing, sproing, sproing over ruts, losing traction bouncing up and down, rain, or shine.., and especially plowing through snow on corduroy/washboard ice.