For us I'd say we save money. But everyone is different. So, different expenses may apply.
If you want to fulltime for the adventure and not being tied down to one place, then you won't miss much about a stick built home.
If anything is missed it would be our family but being fulltimers allows us to travel to visit them as often as we'd like. (and then leave when we are tired of them, or leave when they are tired of us)
Our children and grandchildren worry about us. So we keep in touch and they always have the names and numbers of the places we are staying.
The expense part is a good factor to think about but most of all you have to enjoy the lifestyle for it to work out.