I'm not sure why you're having problems with your jetpack, but remember, if you're trying to "upgrade connectivity" for the jetpack, it's a "cellular signal" not a "WIFI signal"... So, any "amplifier for the incoming signal" would need to be a "cellular amplifier" not a "WIFI amplifier".
Have you considered installing a USB plug connected to your camper battery? We use a Verizon jetpack and I simply plug the jetpack into the USB plug I installed above our radio.
All of the options you listed require either 120 VAC or 12 VDC to function. I'd suggest you install a permanent "reliable" 12 volt supply for your Jetpack and try that before spending upwards of $650 for some of those choices, only to find out your internet reliability isn't "that much improved"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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