We had our plans set; we were going to full time(1) after I retired. A nice fifth wheel(2) on the smaller side, a 1 ton pick-up truck to pull it with, moving from place to place as the mood would strike us.
But, "Life is what happens while you are making other plans." -- John Lennon.
My dear wife (DW) had a stroke April 28, 2005. It turned our world around. RV-wise, we decided that 5er with the steps between the living area and the bathroom/bedroom area was out of the question. It is just too much of a barrier when you don't have full use of you left leg.
So we started our search for a motor home.
(1) full time - FT - to live in a RV full time
(2) fifth wheel - 5th wheel, 5er - a travel trailer that overlaps the bed of a pick-up (i.e. http://americanarv.com/)