If you are planning on bring your MH as part of your travel to Portland ME during the first of April STOP
right there....Maine has a history of big snow storms in April particularly last two weeks of March-first two weeks of April. Most RV CGs do not open until April 24th. There are many great B&Bs you could choose from in the Portland area and the Old Port has some of the finest restaurants you can find (if you love Irish food then Rí Rá
is a must). With that said bring the MH and explore the coast of Maine in May-mid June (better choices of CG's without the over crowding). Trust me, growing up in Maine if you really want a remediable time May to mid-June and Sept-Oct are wonderful times to explore the state (super weather without black flies and herds of people). The snowbirds don't return until end of April.
As far as getting there follow rmac04401
advise especially if you are driving the MH...stay out of CT and eastern MA.
This is just my opinion. What ever method you chose have fun.