A good idea.
When definitive answers are provided, edit your first post to include the list.
I'll have a crack, each car describes advances/changes from previous, most have new body shells on previous.
JRX2 - 1988 - 5 link rear suspension, 2.0 inch 5 spoke orange wheels, LRM transmission
JRX2 Proformance (Proformanance) Kit - 1989 - Upgrade kit for JRX2 to Pro spec
JRX Pro - 1990 - longer graphite plate chassis, h-arm suspension, logo wheels
Junior 2 - ? - Budget version of JRX Pro, molded chassis, plastic front shock tower, actually the influence for the JRX Pro SE's chassis
JRX Pro SE - 1991 - Molded chassis, slipper clutch, black anodised shock bodies, new spring clamps
Double X - 1993 (IFMAR worlds debut) - New transmission, Hydradrive, New molded 'tunnel' chassis, 2.2 inch disk wheels
Double X CR - 1996 - Full graphite compliment, 5 spoke 2.2" wheels, CR rear suspension, new sway bar mount in front arms
Double X CR Kinwald - 1997 - Blue alloy parts, Lunsford turnbuckles, revert to disk wheels, dual disk slipper
Triple X - 1999 (ROAR Nationals debut) - New molded chassis, new molded disk wheels, new transmission, grey hard anodised shocks
Triple X Spec - 2000? - Budget version of Triple X, Blue tyres, blue anodised (not hard anodised) shocks, bushings, white wheels
Triple X Brian Kinwald Edition - 2001? - Blue molded nylon parts, full graphite compliment, titanium turnbuckles, ti nitride shock shafts and hinge pins, threaded shock bodies, Blue wheels
Triple X Brian Kinwald Edition 2 - 2003 (IFMAR Worlds debut) - New Transmission, Variable Length Arm suspension
Triple X CR - 2007 - New transmission (reverts to original Triple X transmission), EA3 composite parts, additional suspension mounting points, multi piece wing kit
Double X4 - 1996 - Triple belt transmission, 5 spoke wheels
Double X4 Worlds Edition - 1999/2000 - milled chassis, threaded shocks, ti turnbuckles, CR rear suspension?, lowered motor mount, new molded disk wheels
Triple X4 - 2002 (IFMAR worlds debut of prototype) - single belt transmission, steel turnbuckles, unthreaded shocks
Triple X4 Graphite Plus - 2003 - full graphite compliment, ti turnbuckles, threaded shocks
JRXT - 1989? - 5 Link suspension, LRM transmission
Junior T - Budget version of JRXT, molded chasiss, plastic front shock tower, one piece wheels
LXT Conversion - 1992 - Convert JRXT to LXT
LXT - 1992 - Truck version of JRX Pro SE, lexan Disk wheels though, same tyres!
Double XT - 1994? - Truck Version of Double X, lexan disk wheels, but fronts have shallower offset
Double XT CR - 1995/1996? - Truck Version of Double X
Triple XT - 2000? - Truck Version of Triple X
Triple XT Spec - 2000? - Budget version of Triple X, Blue tyres, blue anodised (not hard anodised) shocks, bushings, white wheels
Triple XT Matt Francis Edition - 2001/2002 - Truck Version of Triple X BK
Triple XT CR - 2007 - Truck Version of Triple X CR
Trucks obviously have slightly longer chassis, and their development tended to follow the buggies. They seem to carry exactly the same advances between the generation of buggies, other than where advised.
Budget versions obviously ran along side the pro level kits. Each generation of pro kit built on the one before, but the budget kits fit in the timeline. Please don't think the next pro kit built on the budget kits
Let me know what you think guys.
I know I have some (most!) dates wrong, but have bracketed where I know a date has proof. Also done completly from the top of my head, so some parts updates may be in the wrong generation also
Please don't shoot me
Edited for extra kits, dates still need confirmation for some kits.