They will work if you have an inverter and have it turned on. You also will need the battery disconnect switch turned to "ON" or "connect", to supply the inverter.
To use this setup on the move you will need a good cell phone signal, and a hotspot of some type to produce a wifi signal. It's debatable if the wifi signal will make it through the layers of metal and to the truck. In your shoes I would do the setup and make sure all the components are returnable if they don't work.
If you have a decent cell phone signal, you can just run a hotspot in the truck and not have to worry about the signal getting blocked. I use my cell phone, which has a built-in hot spot. Just turn the hot spot on, set up a password, and bam, instant secure wifi. The hotspot is a battery suck, so I keep the phone plugged into a USB adapter that's in a 12V outlet.
If you don't have a decent cell phone signal, look into the Wilson line of boosters. They have them for cars, RVs etc. You can get an antenna for the truck and one for the RV, and move the receiver unit back and forth as needed, I think.
You will get the best nationwide/rural area coverage with Verizon. On Verizon's unlimited plans, they don't care if the data is used directly on the phone or on the phone's built-in hot spot.