If they move trucking to Forrestfield where the terminal is, that would than cause all trucks to converse in that area so I would imagine that would be moving it to another suburb. And they wont do it due that because currently cheaper to run trucks and flow straight into the business parks.
What unions? Transport Workers Union and CFMEU would easily reject any change. If they 'pay there way' all that would do is pass on their transportation cost increases and the consumer and end user pays more. I agree they should pay but it wont happen.
Party donations is easy to determine
Both parties get money from Unions and Business.
Business give more to Liberals due their focus on free enterprise
Unions give more to Labor due their focus on unions and more on gov being the provider
Business's then will hedge their bets based on what's happening in the market.
E.G If Labor goes we going to build metronet they will get funding from train companies, If liberals build roads they will get money from concrete companies.
Unless they can cut outside funding altogether this will always happen
Party donations aren't that easy. Not every enterprise pours money into the Liberal party, and not every union is affiliated with the ALP. The AMA, among the most powerful unions in the country, certainly is not affiliated with the ALP.
There is a clear avenue for corruption when a company pays money to a political party and gets contracts with governments. If companies are paying donations with an expectation of favourable treatment, a) that is wrong and b) we can probably test if that is the case by tracking how the payments differ when the party is in opposition and when it is in power. Because if they differ, the donations aren't about policy decisions, but about kickbacks.
If it is just different industries supporting different parties based on their policies (eg rail transport friendly v road freight friendly) then I have no problem with that. Eg Chamber of Commerce to Libs, Nurses Federation to whoever supports their nurse-patient ratio campaign. If (using your example) a concrete company pays money to a political party, then its competitor will have to match the donation to the political party, or miss out on contracts. That is corruption. If the industry group pays, that is policy.
I would love to see a royal commission on party donations. I think that both parties would rather keep things swept under the carpet.