Used an
ecv for the first time 2 weeks ago, for 9 days.
1) I don't remember! Sorry, but we didn't spend much time in DTD.
2) You can park the ecv inside or outside. When inside, I always asked where they would like me to park it. I recommend inside so it stays cool (those seats can really get hot sitting in the sun

) and dry (daily showers!).
3) Transportation time was pretty much the same for us. We never had to wait for another bus. Loading and tying down the ecv takes a little longer, but not much. Say 5 minutes, maybe 10 for someone training.
I did use Tour Guide Mike this trip, so maybe that helped us avoid needing to wait for a bus that could accomodate us!?!