If I remember correctly, it contains most of the PDF files on Tiffin website. Appliances, inverter operation, Freightliner docs, etc. Website is probably more up2date, although....they could use a little organization on there instead of, say, throwing all the different types of refrigerators or inverters or such in one big pile.
Les & Pam
2017 Phaeton 40QBH-All Electric-380 ISL
2016 Jeep JKUS with Ready Brute Elite towbar