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Yea your right macca, Its a juggle of price, weight and strength.
I used 12mm ply throughout the build and come out just over 40kg, but I have a system which will last a lifetime.
Mdf is cheaper, but you loose strength. So to gain strength you need thicker material so you gain weight.
Do NOT use particle board. Although cheap it will split and halfway down a decent track you'll find you fridge bouncing wrong the cargo area..
Buy the sounds of it ozzy has used both mdf and ply.
If you look around you can get 'top sheets' off the packs for cheap. When it's all covered in carpet who cares if you have a scratch or stain??