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2.
A person that lives in, and creeps around in a vehicle that looks like it's barely held together with rubber bands, chewing gum, and chicken wire. They're often seen parked in the back of supermarket parking lots, or hanging around public parks, alleys, shelters, welfare offices or liquor stores.

Most of the time, the person also looks as completely worn out as the vehicle does.
"Boy, will ya look at that poor rubber tramp cruising on down the street!"
by Starwatcher September 10, 2006
 
1.
A person who travels and lives out of their vehicle (normally an RV, van, bus, etc.). They stop and stay wherever they choose for however long they want, but eventually, so as long as there’s a way to put gas in their tank, move on.
Hey, did you hear man?...Jimmy joined a convoy of rubber tramps!
-Where are they going?
Who knows man!
by RYM~Taistealaí May 19, 2010