Yeah,you should do the right thing and call them. If they say they want you to take the number off,tell them where to get off,it's your truck now and you'll do what you want!!
(at least you can say you did the right thing
)
Seriously. I am 100% positive they would have taken the number off while it was still theirs if they were concerned...or they don't do much thinking. They really have no right now.