Forgove my stupidity but, I fail to understand how living the " full time RV dream " is going to change the possiblity of his future income? Sorry, kinda confused.
Also, you painted a picture of a bed of roses for him. RV ownership and traveling is not all Mai Tai's and yahtzee. It is constant maintenance and work. It is definitely not a
" cheap " lifestyle by any means.
I am not trying to be negative, just realistic. Since you have made your decision, I hope for both of your sakes you have some sort of backup plan in the works, and get a rig with a full warranty, unless you are mechanically inclined.
Best of luck.