While I have other cameras, both smaller and larger, I never carry more than one with me unless it's a paying job. Shooting for pay requires a different approach and I usually carry at least two of pretty much everything.
For travel, we're fortunate in being able to go out of the country on a fairly regular basis. We take carry on luggage only, use public transportation, and walk an average of around 10 miles a day. Carrying more than one camera under such circumstances is a non starter, particularly for someone who hasn't had a
travel camera go down on them since starting photography in the mid 1960's.
While I readily admit that that there's probably some poor sod who, at this very minute, has dropped his camera in the Seine, but chances are it ain't gonna be you
. I wouldn't advocate selling stuff, just don't try to carry everything at the same time. Take as little stuff as possible, you will enjoy the trip more, and your back, feet, and wife will thank you.