If you go with X10, you have some options. If you want local control, you would want to install a switch to the light (WS469 is a good choice that will work with LED bulbs). This will replace a standard toggle switch and work identically even without any other X10 components.
https://www.x10.com/ws469.htmlAnother option would be a fixture module (XPDF dimmable or XPFM relay). These install inside the box at the fixture rather than at the switch. If you don't need a switch, this is a good option. If you have a standard toggle switch, it must be left in the "ON" position for the fixture module to function.
https://www.x10.com/xpfm.htmlhttps://www.x10.com/xpdf-inline-dimmable-receiver-module.htmlNow for remote control, you have some options. If you want motion sensor control, you could look at something like the MS16A. I personally would avoid it if you can't keep it out of the weather. Although it is rated for getting wet, I have had many of mine fail after less than a year when exposed to the south (where my rain and sun comes from). If it's covered, it should be fine. I have a large house and the RF range has been an issue for me, but if the motion sensor is close to the RF receiver you should be fine. You said you didn't think motion sensing would be useful, so this is optional.
If you want to turn the light on from a remote in your truck, you will need a remote! You can get either a palm pad (PHR03) or something more compact (PHR04 or KR22A). If you only need 1 light controlled, you probably would be happy with the PR004 as it's small and could be put on your key chain.
https://www.x10.com/phr03-wireless-rf-remote-control.htmlhttps://www.x10.com/phr04.htmlhttps://www.x10.com/kr22a.htmlX10 works via PLC (power line control), so you need to get the RF signals onto the power line. You need either the TM751 or RR501. For your needs, either will work.
https://www.x10.com/tm751.htmlhttps://www.x10.com/rr501.htmlThere are some other details that might come into play when deciding if X10 is the best fit but this is already a long post. So long as you don't have a ton of noisy electronics in your barn you should be ok though.
