I agree with Kyle. I've had my Edelbrock IAS shocks on my '98. 5 Ram for just about 2 years now. I purchased them JUST after Edelbrock developed them for the 2500 4x4. I still very much like the performance of these shocks. The IAS shocks are of a mono tube, high pressure (gas) design.
On the other hand, there are countless others very satisfied with their Rancho 9000s (adjustable dampening, twin tube, low pressure gas shock). Another extremely high quality shock is the Bilstein mono tube, high pressure gas shock.
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'98. 5 2500 QC 4x4, (BLACK) SLT Sport, ISB, LWB, 3. 54 LSD, A/T, Glasstite Vision II canopy, Line-X spray in liner, 285/75R16 BFG A/Ts on 16x8 M/T Challengers, Warn 4X Boards, Mopar fender flares, front and rear NW Custom stainless steel/rubber mud flaps, Mag-Hytec diff. cover and trans. pan, Edelbrock IAS shocks, Mopar tow hooks, Reese Titan V hitch, Jordan Research Ultima 2020 trailer brake controller, VDO Vision gauges, '00 Sport grille, '00 Sport headlights with PIAA Super White 9007/9004 bulbs, 4-2-7+4 Brite-Box, PIAA Dual Sport 900 auxiliary lights, BD exhaust brake and TorqLoc, Prime-Loc fuel filter relocation kit, Bosch 275 hp. injectors, VA CPC, DD Boost Module, Banks Stinger wastegate actuator, BLACK '00 valve cover, Banks Stinger 4" dia. stainless steel exhaust system, BD LV V-10/Cummins hybrid TC and valve body, BD modified transmission front pump and PressureLoc, Air Bulldog induction hood (with NACA ducts), plus many other trick modifications