fat tires and rims?

[cosworth34677]

my dump railers has a problem. the wheels and tires are to thinn. i got the single tire type set up on instead of the duallys. bu the standard tamiya semi front wheels and tires are really thinn looking. i do like them because they are nice a firm so they hold up the weight i put in the trailer but they look kind of weird.

so dose anyone know where i can find fat wide tires and wheels? i got a set of rc4wd wide truck tires, but they are not really the wide. any help thanks.