Check around the truck stops. They have a nice steel one that would probably hold up nice. A bit pricey though, if I recall, around 300 bucks.
You may have to check more than one, some of them have it and some don't. I have seen them more at the TA's then anywhere else. You may have to check in the shop store not the regular store.
Of course if you can make one, that's what I would do.