Yes, the Thule Evo raised rail feet, # TH710401, work well on your 2005 Pontiac Montana SV6, with factory raised rails that run front to back. Along with the raised rail foot pack you will need a set of 47 inch SquareBars, # TH712200.
Since you will be taking long trips and need space for cargo, I would recommend going with a roof box rather than a bag. A roof box will protect your gear better and will not sit on the roof, possibly causing damage to the vehicle finish.
For a cargo bag... view full answer...
Yes, the full size spare will need to be lowered to provide access to the hitch attachment points, but will fit back into its original location after installation of the Curt Class III Trailer Hitch, item # 13336.
You will need to Lower the spare tire from its storage location. It will be put back in place after hitch is installed. I have included a link to the instructions for this hitch for you to review. We also have a installation video showing the installation of this hitch for you... view full answer...
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