The IBT does have those types of pensions. The muti employer plan is one of many types of plans . Plans range from 401k's to single employer plans. Know one is entering a current multi employer plan , no money from Xpo or any new company is going towards a current Muti employer plan .
Establishing a new Union that could take on a Giant like Xpo would take major investment in money and time to lay out the infrastructure and legal requirements. I am not against the premise just not as easy as one might think .