Got my black sink table. Set it up with water and a drain stop. Everything looks good. The idea is that I can now wash my larger plates measuring 11x14 , 14x14, 12x20 and 16x20 inches, outside of the darkroom trailer.
I will fill the sink up with water, insert the plates and use a circulator pump for agitation. Wash the plates for at least an hour. Then drain the water and rewash as needed. It should be a sound and archival method. I can then dry the plates and travel.