Grapes of Wrath

please if able to answer in "well developed" paragraph

-What causes the mass migration of dispossed small farmers to California?

-Describe the Joad family vehicle and how it was set up for the trip to california.

-Compare the migrant camp outside Bakersfield with the government camp at weedpatch.

-Describe the relationship of Grampa and grandma to each other and to the land.

-while migating to California, what unwritten laws serve the evolving agricultural underclass?

-who or what exploits migrant workers?

-how does Jim Casy fight exploitation?

-explain how Tom's character expands.