What I did:
Any router with an external antenna, then remove the OEM antenna and purchase a high gain and feed the wire through your cab and mount... well anywhere you like really. The one I have has a magnetic base so it fixes to my roof. I plug the router into my rear AC plug (if you dont have one just get a pod that plugs into a 12v dc and converts it to AC). Create a wifi network. I make mine hidden so others cant see it.
I use a wireless camera in the trailer. Again, as long as it has an external antenna, you can swap that with a high gain or just put an extension wire in. Its mounted on the roof (fed the wire through a vent) and I have it powered through the 12v DC of the trailer.
Join the wireless camera to the wireless network you created in your truck with the router in step 1. Join your phone to it (after you installed the app) and voila!
I went a little further and set my router up to use a 4G WAN in the truck as well, but that's not necessary.
I am sure there are more elegant boxed solutions, but this is what I came up with using scraps in my IT pile.
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2015 Ram 2500 Limited 6.4L Hemi, 3.73 LS
2007 Jay Feather 254 EXP "HMCS Anchovy" :Canada:
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