google retroshop you will see what I am talking about for retrofit projector headlamps
Many here at the site have them, or theres converted or modified by them.
There is a ton of information on the internet to help you with this, and places that have retrofit projector headlamps, take your time with anything and get informed, you will find lots of crap out there, and some really great stuff, talk to others here about how they did there's, or there experience with this type of situation.
But if you ask me what I would do to get the condensation out.
I would remove my headlamps and protect my light bulbs with something, or wrap them up so they don't get any crap on them. I would bring my headlamps in the house and let them get to room temperature, then heat them up with a blow dryer till no more condensation is seen, let them get back to room temperature and check them again, this should be ample to get condensation out of there, you could use your stove, but that's up to you, I don't want you to screw up your headlamps cause you did something your not used to doing. At least with a hair dryer you not going to melt them, just heat them up so its hotter inside the lamp enough to get rid of the condensation. Once they come back down to room temperature, check them to see how they look, repeat if necessary, if it all looks good, and they are at room temp, I would put them outside and let them get back to the outside temperature, see if there is condensation that returns, if not, I would put them back on the truck and see what happens, if the condensation returns again, here is where i would do a bit more research, those holes in the back of the headlamp assembly are there for a reason, they are breather holes, I would dig a bit and see if I can find more information on what to do or how to keep the moisture out. Again this is just my opinion, others may say something else, anyways that's what I would do to start off with.