I finished converting SCANIA T164 KvH-DeSiGn's King of the road.

Installion
linerun.dff and linerun.txd put into gta3.img.
You must have installed wheelmod

default.ide: 
133, 	linerun, 	linerun, 	car, 	LINERUN, 	LINERUN, 		null,	big,	 	10,	7,	0,		249, 1.0

handling.cfg:
LINERUN         5800.0 2.6 7.5 3.5 0.0 0.0	0.0  90  0.95 0.65 0.4  5 120.0 18.0 R D 8.0   0.30 0 25.0  1.8  0.04 0.65 0.25 99000 0.28 -0.10 0.5  0.0		2000100		0  1


Automatic installer:
You must create a gta3.exe into GTA VC folder. And just install it.