Matt I use Einszett Gummi Pflege on the rubber door seals and weatherstripping.

For lubing the door latches and handles so they don't freeze I use the DuPont Teflon Multiuse lubricant available at Lowes for $5 a can.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards