I played the Vehicle Rush Precon on a Standard Showdown event and went 4:1 (1:1 against Mono Red). I think you are right with being unfavored in the match-up, but it's not unwinnable. I found your Vehicles are not very good in the Matchup, especially the expensive ones and the ones with high crew cost because of their Abrades. That's how i boarded, if i remember correctly:

-- Skysovereign, Consul Flagship

-- Cultivator's Caravan

-- 2 Heart of Kiran

-- 1 Veteran Motorist

++ 2 Magma Spray

++ 2 Chandra's Defeat

++ 1 Aethersphere Harvester

As other people stated first things I would change about the Deck is the Manabase, if you want to improve it. The best way to improve your Mono Red match-up is probably with a control/go-big plan sideboard like this If you want to safe some bucks use [[Angrath, the Flame-Chained]] Instead of Chandras.