Southern California Patio Compsite plastic materials

I plan a garden next spring. We live in an apt with limited space, but we have a wide patio/front deck area that will work. I previously did a small patio garden using light plastic and terra cotta pots. But these deteriorated quickly in the strong Southern Calif sun's UV rays. And the planters I used tipped over during the occasional strong Santa Ana winds (35-50 MPH gusts) breaking the pots and plants.

I'm planning a movable platform with four 12x12" composite square planters set on a 2x4' or so grid platform on rollers so it can be moved when maint cleans the deck. The plants cannot extend horizontally much beyond 2 feet due to foot traffic. The garden will be vertical so I will be installing trellis-type grid support about 4-5 feet high for climbing veggies - cucumbers, melons, peas and beans, mixed in with flowers. So two feet or so should be sufficient.

My question is, has anyone ever used composite plastic planters in a similar layout that they can recommend? Or is there another type of pot that I can use that has some weight to it so it doesn't end up in the next country due to winds. I'd appreciate any suggestions, as to what materials to buy or how to construct the moving platform.

Could you circle the pots with a bungie cord(or more than one bungie cord linked together), or rope, or those cinch-able, size-adjustable belts that movers use to lock things down in the back of moving trucks, to keep them together? Maybe four at a time to start with, and another around all of them at once if you want to make them more secure still? That would make for a lot more mass the wind would have to fight against to move even a single pot.

Alternatively or in addition, could you put attach pegs to the cart that would restrict movement of the pots? If not by hammer and nail, then how about using those C-shaped clamps you can tighten down on the rim of the cart, the tightening rods acting as peg barriers to the pots?

P.S.: The leaves on some of those plants you want to grow can get pretty large. I could see them being tough to keep within their allotted space simply because of that.