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Originally Posted by MichaelS78
6" Retaining wall blocks or 2" 12"x12" paver blocks sounds like a great idea too. Especially since they can be partially buried. Thanks!
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While it might be tempting to get the thinner patio blocks so you could adjust the height, a half-buried retaining wall block will be a lot more stable than a stack of thin ones, even if one or more of the thinner blocks was to be buried.
Thin paver blocks are often made of a lower grade of concrete than retaining wall blocks. They are also more prone to breaking just because they are thinner.
The fines in your CSTC top course will eventually migrate down into the low-fines CSBC (base course) via gravity and rain. I don't know what the base under the imported gravel is like, but the clean base course may also migrate downward into your "native" soils due to the lack of fines.
Over time, settling could cause a stack of the thinner blocks to tip, especially if the trailer is parked and largely ignored during the rainy season.
For these reasons, please consider using the larger and more stable blocks if you go this route.