Hello Petef,
Thank you for bringing this to our attention. Yes, to get the installation discount the parts do have to be purchased at the Camping World location so if you wanted to use that discount, I recommend going through the store. Regarding the difference in shipping, I would need to know where the original quote came from in order to compare the 2 within my research. You can send this information to me via private message. Please let me know if I can do anything else for you. Thank you and have a good day!
Elizabeth Black-Osborn
Marcus Rapid Response Team
