Update:
As of July 2020 this strat is outdated. Instead the "High Multi" strat is recommended.
Basics:
Enable the Runaway mode and choose the Hot Rod. It will work using Automatic or Manual Transmission. You might try both and see, which one works out better for you. Do a fast RST, face the oncoming lanes and drive onto the very left lane close to the rail. Directly after face the spot between the 2 oncoming buses and try to crash/bounce off the right laned bus. While doing all this you should boost for the whole time.
Example Video
Scenario:
The Hot Rod should then fly over to the traffic right at the gas station and fly into the truck (18 multiplier) or the bus behind to flip that one. A lot of times this scenario will work out luckily. Also catching all 18 multipliers is a rather rare thing to happen. There are several different scenarios which also seem to happen rather luckily.
Example Video: Flipping the Bus behind TruckExample Video: Trailer HitExample Video: Flipping the 1st two oncoming Buses
Tip:
You can try around with the angle when crashing between those 2 buses to fly over to the gas station. Try out a sharper or wider angle. Also try around where to hit that bus. Plus you can also work on the technique how to crash between those buses.
For me it seemed using a smaller angle and trying to hit that left 1st oncoming bus into its back worked out good.
Version differences:
Heavier Gamecube physics seem to fit that strat better cause it makes the Hot Rod bounce off better of those buses to fly over to the gas station.
Non-glitch:
This strat is also the best one to use for non-glitch scores on this zone. The best scores and damages were done with flipping that bus behind the truck (check the example vid "Flipping the Bus behind Truck" on the links above). Yes, this will cost you 1 multiplier, but the additional damage from that busflip will pay out at the end. But on lucky working out scenarios, you also can get additional busflips if you fly into that truck to get all 18 multipliers.
Alternative strat:
As for a long time only the sink-glitch was used on this zone, the "Hot Rod 18 multi" strat can still give you very easily a Top-25 spot, especially compared to the other strats. But if you want to keep the potential open for scores above the 70 milllion mark, it is highly recommended to use the "Custom SUV Glitch Strat" or one of the "Trailer" strats.
Potential/Outlook:
As this strat is not really done for (very random happening) scenarios to get the truck into a nicely folded position to glitch, scores already seem to reached its limit. You could probably get a very high non-glitch score, if you success to flip the 1st two oncoming buses and still get the crash working out, but there is a lot of luck involved. Even more, if you want to get the truck to glitch in one of those random happening "folded truck" scenarios.
Additional Vids:
Highest Damage $3,746,373Highest non-glitch Damage $3,589,166Youtube Playlist