the answer is sublime not obvious
You want a deuce, get one. That is easy and the obvious answer and you do not need to sell anyone else on the idea. Here is where the less obvious solutions arise.
Women, in general, love attention. Face it, they just do love to be paid attention to. That is a foregone conclusion and will never change no matter how hard you try, or even they try to change it.
Put your wife/G/F in the deuce, ride around town and let her see the waves, smiles and positive remarks, and all of the sudden, they will think its great and tell everyone it was THEIR IDEA to get one.
If your G/F wife decides to never ride in it, let time pass and one of two things will happen:
1) They will hear all the neighbors and your friends raving about the truck and how cool it is, or how PATRIOTIC you are, and voila' they will see the light or.....
2) Even after hearing all of this positive and wonderful stuff they will sit there like a bump on a log and still say no, and eventually realize that they do not control you, and they want to, and they will leave.
Either way, you win.
You cannot change the basic laws of physics when it comes to men and women.
This is just one of those inevitable situations you will find yourself in in life.
Your best adise is to do what seems right, and let the chips fall where they may. Besides, its like evolution....you cannot cheat mother nature.....
RL