In the mission 'Nice Package', Vic says that Umberto worked for Marty for years and Umberto doesn't deny it.
Why would Umberto be working for Marty? It would make sense if the Trailer Park Mafia was stronger than the Cuban gang but I never got that impression. What do you guys think?
Bonus question: In 'Nice Package', Is it possible to collect the package before any of the other drivers does? I have been close but it's really tough to pull off.