I just converted my entire truck camper to LED's from M4products.com
They have very good descriptions as to what types of bulbs their LEDs replace. Just pull out a couple of bulbs from each type of fixture. Chances are your truck camper only has 2-3 types of bulbs at most on the interior. Exterior lights might be a different story.
I don't have any financial interest in that website. Just a satisfied customer.
The bulbs were great and I would rather trust a reputable company than some random Ebayer. But, that's just me.