Shopping in the US and bring items back to Mexico.

When I moved my rv 5th wheel to Baja at the border in San Ysidro/Tijuana it was searched by Mex customs and nothing was even questioned of my belongings.  Now however I want while renewing my visa to shop in the US and bring stuff back with me but other than the obvious drug restrictions and lumber I'm not at all schooled on what can be brought back.  Is there a link or list of these things?
Thank you,
M.W. Stanley

Hi, this is the official explaining the options also during the holidays the amount via land goes up to 800$ USA if I recall proprely this based on the premise that you are a Residency card holder (permanent or temporary)

http://www.sat.gob.mx/aduanas/pasajeros … exico.aspx

Adios y buen dia a todos, GyC.