recycled asphalt sucks too.
it stinks for years and then one day it finally sets up and you can't ever re-grade it. it's like a really crappy old country paved road.
it's fine for base but not finish.
You're just going to have to pay the piper
either re-concrete it. (why are you tearing out concrete to put something back in? just to park a trailer) or get 3/4 granite. (not river rock, it's round, like walking on big sand)