Campervan connectivity options

Hi,

A family member has recently brought a small 2-berth campervan as part of their retirement plan and is looking for options for connectivity on the road. They have a smart phone, laptop, chromecast and TV (satellite TV and radio). Their current solution for connectivity on the road is tethering to their phone and would like a better solution.

I have been thinking of setting up a wireless modem, router and AP so that they can essentially use their devices independent of the phone and so that it can be powered of the 12v camper supply. The plan is to share their 2degrees data with the device so no extra plan is needed.

The equipment will be stored in the bulkhead of the camper so is likely to be subject to quite a bit of vibration and heat.

I've considered:

Huawei B315 (or similar)

Pros: cheap, reasonably easy to setup, external aerial compatible

Cons: need to play with power for 12v, bulkyish

TP-Link M7350

Pros: relatively cheap, small form factor, runs of USB

Cons: no external antenna, not particularly robust

Teltonika RUT240

Pros: robust, multiple wiring and voltage options, looks to have best antenna set-up

Cons: more pricey, not heard of them or used them before.

Other?

Any thoughts on any of the options, or viable alternatives?

Thanks in advance.