Cleaning out a DIY septic tank

wopachop wrote:
.... We have an RV dump setup. Years ago i was told its (2) 50 gallon drums welded together with holes drilled in it.

Worked great for over 10 years. I think we finally clogged it up. ...

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You indicated you had two barrels welded together I'm assuming they were steel and not plastic.

I've had single 50 gallon drums sitting in the yard with the lids still clamped on that were sealed with left over grease residue inside them that didn't last half that long before the bottoms and tops rusted out.

What you basically have is a now failed improvised septic system. I doubt there's much left of the original barrels still in the ground it hasn't rusted away. The holes would only let the liquid drain out so any undissolve toilet paper and solids would have collected in the barrels for 10 years. I doubt that you're going to just blow them out the holes in the barrels.

Most likely the barrels have been rusting away, filling up with solids and or caved in by now.

I think you're going to need an entirely new improvised septic system for the trailer to dump into.