Thanks Azeroth.
To add optional Laxle and Lking lengths would require changes to the database. For now the best method is to create two models one for each position. Drawback is It doesn't allow you to do direct comparisons. I'm sure this would be a track dependent handling change for a truck/buggy not a fine tuning adjustment. That's the best I can offer for now.
I plan to look at modifying the database to add some new variables as there have been lots of requests. I need to make sure it is implemented in a manner that doesn't cause anyone to loose any data though. I'm sure you can appreciate that concern.
