Not sure. While VP can be a fairly useless spot, it does pave the way for being the next nominee for your party. It gives the person experience in dealing with the ins and outs of the federal government, it gives them a chance to show what they are made of, in certain cases.
I doubt the Republicans would even consider DeSantis and Haley together on a ticket. Face it…Trump is THE candidate to beat. I know many of you don’t like that, but it is a statistical fact. If you combined the percentage of those polled in favor of the various candidates, you could add DeSantis and Haley together and still not come up to the support Trump has.
And while either one might consider being Trump’s VP because Trump can only serve one more term, I doubt he would choose either one. From a political perspective, and given the treatment he got the first time around, he would be better off choosing someone that is truly onerous to the Democrats. Kari Lake or Christie Noem or even someone like Tucker Carlson. By choosing a running mate like that, he would be doing exactly what the Dems did with Biden…putting somebody in place that is such an intolerable choice the opposition wouldn’t dare to impeach him for fear of putting that person in as POTUS.