For Guatemala you'll need to go to the border and officially import them before you can sell them as you probably already know they are entered in your passport.
To officially import them, at least for US registered vehicles, you need the title, bill of sale and a copy of the check or other instrument you used to purchase them (all of these can be "created" if you have misplaced the originals if you know what I mean).
Once you have done that you'll have a fist full of papers showing that you've paid the duties and taxes and off you go. Sell it to whoever then wants to buy it.
Failing that sell it at the border before entering the one country but after leaving the first one (I doubt you'll find many takers though).
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