There's 2 ways to do this. 1st is get an appleTV for your truck with the HDMI to composite adaptor. Use the trucks WIFI as your network to AirPlay from your IPhone to your ATV. You're just using the trucks network to connect the 2 devices not to stream. This will run you about $100. The 2nd way is to get the lightning to HDMI and the HDMI a to composite adapters. This will run you about $70.
Do you use a Mac or PC? I remember sharing a few of my iTunes videos with a friend using a thumb drive. That may also work. Not sure if cue would play them in that format.