I too am of the thought process that you pick a car that just barely gives you the win. I just completed the GT All stars Amateur in a C5R with Medium tires. Very tight races. Some I passed for the lead on the final straights.
As For the Trial mtn. Enduro
I took the Lancer Evolution VI GSR, added Super slicks and an Oil change.
ASM = 4; TCS = 1
Faced off against:
Mazda RX-7 Type RZ(J): 71 laps (31+ seconds behind me)
Supra RZ(J): 71 laps
Impreza WRX STI(J): 69 laps
Skyline GT-R Vspec II (R32, J): 68 Laps
Lancer Evolution VII(J): 68 laps
AI Pitted on laps: 23, 46, 69
I pitted on laps: 12, 24, 37, 49 (27.152sec lead) and 61 (32.371sec lead).
The lead changed hands 8 times, in the first 22 laps. I took the lead on lap 22, lost it on Lap 25 due to dropping time in the pit. I regained it on 32, lost it when I pitted on Lap 37. I regained it again on Lap 44 and held it for the remainder of the race. The closest 2nd place managed after this point was 9.5XX seconds.
Side Bar: Lap 58 was a 141.000, Interesting.
As an additional adventure in this race, I began to take advantage of drifting into the tight corners, and blasting out of them. By kicking the tail out slightly just as I entered the corner, I was able to exit at a much higher speed.
Best Lap: 138.466
Total Time: 12037.264
Average Lap: 141.933
Total Laps: 71
I encountered Lap Traffic on Lap: 21
This netted me 150,000cr and the Mines skyline.
AO