@nilshamilton Wow - How frustrating to have him so far away and not be able to do anything for him. I feel your pain as my daughter is quarantined for over 3 weeks in Minnesota and we are 1500 miles away.
There is one more thing to consider at this point - states are beginning to limit travel through them, so the cross country drive both ways may be uncomfortable, to say the least. For example, Arkansas is moving to ban out-of-state guests in the hotels and motels. Texas is stopping travelers (not commercial trucks) coming from Louisiana to question & register them. People leaving South Texas to go north are finding some of their usual hotels/motels closed. These scenarios are popping up day-by-day. So if you go by car, you may find yourself and your son on the road with no place to go, unless you have a motor home/camper van to safely stay in at truck stops or rest areas (everyone including AAA reports these are open, at least along Interstates.)
Unless you feel he is in actual danger, it might be best to encourage him to ride this out a few more weeks until things settle down as far as cross-country travel. That is what we have decided to do here with a number of our neighbors...
Sue