American RV, 13320 SW Pacific Hwy (old Hwy 99W), Tigard, OR 97223, (phone: 877-394-9635) recently installed Gas Spring Strut Roof Lift Assist Units - 30 lb & 40 lb on the rear & front exterior walls, respectively. My 2004 FWC Grandby only has empty kayak saddles attached to the FWC luggage rack on the roof.
I could not lower the front exterior wall with the 40 lb struts because my roof was too light in weight. So, Jeff & Clint replaced the 40 lb struts with more 30 lb struts. They work GREAT! I am glad I did not try to install the struts myself.
Refer to: SUSPA brand, Lift Assist Gas Spring Struts: 15/36; Part # C16-22241.
For sales & service contact American RV in Tigard, OR. Jeff, Clint and the lovely Keri will take good care of you.