Building a parking for the trailer and cover suggestions

I used a material we use in the construction industry referred to as (crushed limestone 411).
After I did the excavation in my yard, I used this material and it gets hard as a rock, and has a great looking limestone color to it!
Serves great for parking my TT on it.
Can purchase from basically any gravel pit, but this isn't the cheapest material out there. But works extremely well and looks good.