At a campground it makes quite a bit of difference on stability if your tongue block is up on a good size block.
I made a square one out of treated 2" x 10"s with a 3/4" top. and spray painted it black.
At home when it is in storage, I just use a some scrap lumber to keep the plate off the ground.
I also have smaller boxes that I made for each stabilizer, also painted black.
When I am traveling I just put them in the back of the truck. At home I store them in the garage.
Once a year I clean them and repaint them.
They have served me well through two trailers.
Jack L