I always carry it with me but usually they have some sort of screen casting tech around already. I do make it clear from the planning stages that they need to

I always carry it with me but usually they have some sort of screen casting tech around already. I do make it clear from the planning stages that they need to provide either one of 3 video inputs to their selected system (HDMI/DP/Screen casting) or they need to provide the computer that I can use to remote into my 13"(this is what they usually choose if they have older screens or projectors).