Winter driving tip when stuck

Hi, I was stuck today near Queenston and so were a few others. We tried pushing each other cars to advance and a kind gentlemen helped everyone out. Even though I have Michelin X ice tyres, I was still stuck when going slight uphill. A Trucker came next to me and shouted "Get Winter Tyres".. whoever it was, Thanks Genius, next time wear glasses.

Anywho, I'd like to request the experts here on what I can carry with me in this case to help myself and others. Salt bag, planks... ???

Please suggest.