"Is there an overflow that we could have been reaching due to it not being level? It's manual levelers and I use a drill on them. But I don't have the manual rod for making this taller than what I can do with a socket wrench, I haven't found one to buy one yet."
The stabilizers on the corners are not for leveling.... To level side to side pull the low side of the trailer onto blocks or wood enough to level (chock wheels)..... front to back level with the front jack......... The corner stabilizers are only to help to keep the trailer from shaking..........
Good Luck finding your leak as before probably a connection somewhere.....
Enjoy..........