Adding tracks and trucks into MTM2 is not difficult. just download PODMAN.ZIP and extract PODMAN.EXE to your MTM2 directory. (usually C:\Program Files\Microsoft Games\Monster Truck Madness 2) Now let say you want to add the Metalo Rumble to MTM2. First you download METALO.ZIP then you extract METALO.POD to your MTM2 directory. Then startup Podman and double click on METALO.POD. Finaly click ok, startup MTM2 and enjoy.
(NOTE: you have a limit of 30 pod files in the top list. You can get a limit of 99 if you download and install the patch.