Beautiful pictures in your blog.
You might contact:
Bob Salomon, HP Marketing; tel: 800 735 4373 Gepe, Linhof, Rodenstock, Wista, Heliopan, Braun http://www.hpmarketingcorp.com/about-us.html
PO Box 715 Pine Brook NJ 07058 USA
He is the US distributor for Linhof and the other products listed. I am guessing he would know if any of his dealers offer a rental. He is very active on the Large Format Forum, but you can probably reach him by phone, his site or mail.