Plotter, think long and hard about it, then go and become a bomb disposal man, or something equally lightly stressed!
a) you will not make any money. Friends of mine could not make it pay with their own cars, so if you have to pay car expenses, which you will, you haven't a hope.
b) you'll not be able to use the caravan, particularly in the summer, cos people want to learn in their leisure time.
c) You won't see Mrs Plotter except at the end of a long, stressful day. Not the best recipe for harmony.
d) see (c). The stress factor is enormous.
Seriously, mate, don't do it.