Should I "winterize" my Roadtrek for the summer?

[AG_Ltd]

Hello all!

My 2013 Roadtrek Agile (Mercedes short sprinter) will be parked 6 months in the hot Arizona sun. A friend recommended that I leave it "winterized" to protect my seals (such as in the toilet) from drying out.

I've never heard of this. Is it a common practice i.e. a good idea?

Thanks!