According to the union, the strike threat has been triggered by changes in the industry over recent years which have seen supermarkets and oil companies contract out much of their delivery work to haulage firms.
This has led, the union says, to a driving down of conditions across the industry.
While employees enjoy some legal protection when they find themselves being transferred from one company to another, there are gaps in the legislation.
One of the biggest issues is pensions. In some cases final salary schemes have disappeared completely.
The union also alleges that some of its members have found themselves being expected to work 15 hour days as employers try to push drivers' hours to the legal limit.
Unite says it has tried to sit down with employers to resolve the issue, but without success.
Now drivers are being asked to back a strike in an attempt to force employers to guarantee national terms and conditions.
"Minimum standards on safety and decent terms and conditions are a prerequisite for success in this sector," said Mr McCluskey.
"The attacks on workers' pensions must cease and the merry-go-round where drivers can have as many as twelve different employers must stop too. Quite simply enough is enough."
