1. Changing the wheelbase https://www.beamng.com/threads/modding-tips-my-mods-blog.84789/#post-1420644 2. How to edit a mod file (Jbeam) while BeamNG is running. https://www.beamng.com/threads/modding-tips-my-mods-blog.84789/#post-1420709
Glad I could be of help to you! In addition, you can change the width with the "$trackoffset_R+0.15" part.
1. Changing the wheelbase open "suspension.jbeam" file and find the code for the wheel hubs. Change the Y-axis part of the node offset. Code: ["wheel_R_5","steelwheel_14a_15x7_R","Rear Wheels", {"nodeOffset":{"x":"$=case($trackwidth_R == nil, $trackoffset_R+0.15, $trackwidth_R)", "y":1.18, "z":0.30}}], "y":1.18
2. How to edit a mod file (Jbeam) while BeamNG is running. Move your mods here \Users<username>\AppData\local\BeamNG.drive\0.24\mods Launch BeamNG, open the Mods manager and select your mods. Click "Unpack" on the right side of the screen(in red) For mods that do not have a mod_info folder, click on "Pack" in the upper left corner of the screen. \Users<username>\AppData\local\BeamNG.drive\0.24\mods\unpacked Here is your mod folder, so you can edit it freely during the game. Another way: Move the unzipped mod folder directly to the "unpacked" folder. \Users<username>\AppData\local\BeamNG.drive\0.24\mods\unpacked Just put the mods in the folder. Easy! Note: If you change the Jbeam file name when editing a mod, it will not load and you will need to restart the game.