There are several approaches to improving the AC system available:

1.    increasing the capacity of the existing system;
a: Tinted windows
b: Change the pulley ratio and spin the compressor faster
c: Install a clear plastic curtain between the drivers area and the rear
seating so the driver gets the cooling.

2.    installing a higher capacity system to replace the existing one;
a: Insulate the freon lines

3.    Installing a secondary AC system to provide additional
heat-rejection
capacity;
a: Insulate your side and roof panels

4.    Alternative approaches not listed.
a: Use a roof mount unit like used on imported diesel 2-4 ton cab over
trucks. Ie Isuzu, UD etc.

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