jason, the first thing to check is if leaving the trailer hooked up is legal where you live.
for the sewer i suggest you look into something like a Macerator or Blue Boy for those needs.
you'll need a long water hose and possibly insulation if it gets to freezing.
the proper electrical hook-up to handle your needs is a must. a long distance requires very thick wire.
as for the width, don't forget that you'll need room to open the door :-)
2012 F150 Super Crew 5-1/2' bed Ecoboost 4x4 3.73 elec. lock diff. Propride hitch
give life. kidney & pancreas transplant 9/9/06
Ingrid-my unofficial '"World's Oldest Streamer" 1909-2008 R.I.P.