Get a Surface Go with LTE (or if you need TPM a Surface Pro). Then get a small bag of usb-a dongles for your needs. For the head unit issue, something like htt

Get a Surface Go with LTE (or if you need TPM a Surface Pro). Then get a small bag of usb-a dongles for your needs. For the head unit issue, something like https://www.epiphan.com/products/kvm2usb-3-0/ https://www.epiphan.com/products/kvm2usb-3-0/ could work.