A very nice FTP site.  Thanks for that link.  I sorted the files by date to make a little more sense of it, so here is my take:
File: mtmtrial.exe 	11943 KB 	8/15/1996 	12:00:00 AM
The very file that got me hooked on this game.  I ran the trial for a few months before buying the game.
File: index.txt 	1 KB 		8/19/1996 	12:00:00 AM
An obligatory caution for people poking around in FTP directories.  
 
File: Crazy8.EXE 	735 KB 		12/20/1996 	12:00:00 AM
File: snowy.EXE 	830 KB 		12/20/1996 	12:00:00 AM
File: sierra.EXE 	1045 KB 	2/18/1997 	12:00:00 AM
Ah, the TRI add on tracks.  Sierra logging is one of the best tracks ever.  The .exe extracts the .pod file and adds the track to your pod.ini file. (The original install of the game had no pod.ini file, but these tracks created it or added on to it for you.)
You asked if anything was missing, and yes, one of the TRI tracks is missing, King Of The Hill.
File: mtmpatch.exe 	1056 KB 	1/15/1997 	12:00:00 AM
This is the only MTM1 patch.
File: README.TXT 	1 KB 		1/22/1997 	12:00:00 AM
File: DirectX3.exe 	6221 KB 	1/22/1997 	12:00:00 AM
File: dxcheck.EXE 	115 KB 		1/22/1997 	12:00:00 AM
A DirectX upgrade, required for the MTM patch.  Remember when every game you installed included a different version of DirectX?
File: challenge.EPS  	3702 KB  	6/6/1997  	12:00:00 AM
File: MTMlogo.EPS 	5428 KB 	6/6/1997 	12:00:00 AM
File: Laguna.FH5 	42 KB 		6/9/1997 	12:00:00 AM
A couple of pictures, not sure what the FH5 file is.
File: MtM2trial.EXE 	18059 KB 	5/8/1998 	12:00:00 AM
File: mtm2pat.EXE 	909 KB 		11/11/1998 	12:00:00 AM
MTM2 trial and patch.
MIYH