There were two camps at Treblinka, the labour camp TI and the AR camp TII. A reference in a document from someone who worked on AR, Hofle, about arrivals at AR camps, is speaking about TII.
I already have, again, here;Don't talk show us the evidence.There is evidence of wood deliveries.
http://www.holocaustresearchproject.org ... speak.html
"I went to Sobibor together with Lorenz Hackenholt, who was at that time in Treblinka. First of all, I went with Hackenholt to a sawmill near Warsaw. There Hackenholt ordered a big consignment of wood for reconstruction in Sobibor."
Try and remember.