lupus and emphysema

We are planning a family reuinion to the NC coast for the end of June and my favorite Uncle (75yrs old) is hoping to go with us. Unfortunately my Uncle has emphysema and lupus (in his lungs). He's been on oxygen for quite some time and I know this sounds unlikely, but other than these two major issues, he is basically healthy. Is there anything that he can do to boost his immune system or to make sure he is strong enough to make this trip?? It would really mean a lot to him. Thank you in advance for any suggestions.