HP Velotechnik makes dual suspension 'bents (no 26/26 models though):
http://www.hpvelotechnik.com/produkte/index_e.html
You can buy them from the Hostel Shoppe:
http://www.hostelshoppe.com/brol.php
I have ridden my Volae Expedition off curbs with no ill effects - obviously you have to go slow and take some care.