The OP did not say whether they were going to travel the entire time or land somewhere for the duration. If the latter, some parks have cable TV available, and you might be able to get internet via that TV connection. Not helpful unless you are staying put, though.
There are a couple details missing from the discussion of Verizon Mifi hotspots. The first is that Verizon offers two different plan systems. One is a prepaid card system, the other a "permanent" account system. They've told me that the device from one is not usable on the other, so you have to decide which way to go before you buy the device. The second is that they recently changed the deal on the permanent system. It used to be that you could turn the usage on and off at will, and there was no charge when it was off. Now there is a $10 a month charge when it is off, but still $50 a month (minimum data, 5 GB limit) when on.
The other thing you need to know about the Verizon Mifi is that it will work in Canada as well as in the US, but there are substantial roaming charges when used that way. This can get you some nasty surprise bills if you happen to be near the Canadian border when the device decides that it can get a better signal from a Canadian tower. To prevent that, you have to change a setting on the Mifi from using global signals to using only LTE/US signals.
I was gifted a permanent Verizon Mifi device a couple years ago and used it a lot while traveling. It worked fairly well most places, and I found that those places it didn't work were usually only a few miles away from a place it would work. But I can't claim to have checked everywhere.
