David Baerwald,

Regarding: 

P.S.   I’m not exactly sure what you’re talking about.  When you say “truck garden” do you mean as defined:  truck garden (alt. truck farm): A farm that grows vegetables for market. Or (& it feel’s like a stupid question, but, because you live in the city…) do you mean to put a garden in the bed of a truck?

This actually was a no-bullshidt question; not trying to be absurd or anything.  So maybe throw me a bone:  Are you looking to create a space saver raised garden bed … or to greenhouse/farm produce for market? 

I’m asking because we have some experience in raised garden bed and small space gardening, not a whole lot…but the family took part in a local experimental gardening project, so I’m curious (is all).  Also my bro-in-law has a very productive, large for the desert, garden north of the grapevine…so he may have soil condition recommendations that I can pass on for your region.  [hey, FWIW] 

Be Well,

Messybear