If your Verizon WiFi 7730 is itself inside your RV, what makes you think the signal is weak and needs and extender?
Your profile doesn't list your rig, but RV's are only 20-40' long for most part - any wifi unit should easily cover that...
If your unit isn't in the RV - or you are trying to extend the signal beyond the RV - might be different... But my linksys wifi router or phone hotspot are both available easily throughout the RV and on neighboring sites.
I use a Picostation unit to pickup wifi outside the rig, and rebroadcast it inside through my linksys router when using campground or other wifi...
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)