Green’s Dictionary of Slang

trailer n.3

[the SE trailer where such visits take place]

(US prison) a conjugal visit.

[US]A.N. LeBlanc Random Family 129: Cesar’s adult designation made him potentially eligible for conjugal visits called trailers. Trailers were named after the actual trailers [...] where inmates could spend overnights with their families.

SE in slang uses

In compounds

trailer trash (n.) (also trailer park trash, trash) [SE trailer + white trash n.]

1. (US) poor whites living in trailers (large, static caravans), exhibiting a lack of sophistication and enjoying what is seen as a distasteful lifestyle; thus trailer trashette n., a young female of this type.

[US]Fort Worth Star-Telegram (TX) Life & Arts 1/2: It is the last acceptable slur in our p.c. world: ‘Trailer trash’.
[US]T. Fontana ‘The Truth and Nothing But...’ Oz ser. 3 ep. 1 [TV script] I saw you in the visiting room with that piece of trailer park trash.
[UK]Observer Rev. 20 June 6: Tilly [...] is the trailer trashette our serial killer promised to marry.
[UK]Guardian Editor 10 Mar. 16: The utensilised, polymered, tetracyclined princess of Tinseltown trailer-park trash.
[Aus]K.F. Bartolo in Pragmatics & Intercultural Comms 14: Australians have an affection for bogans that is not reflected in North America’s loathing of trailer trash.
[US]T. Robinson ‘Delivery’ in Dirty Words [ebook] From bird to trailer trash in one neck swivel.
K. Barrett ‘Thirty Dollars’ in ThugLit Sept. [ebook] Everyone at school calls me trailer trash too, but we live in a house, so I don't think it really means anything.
[US]S.A. Crosby Razorblade Tears 22: ‘Fuck you, Buddy Lee [...] You ain’t nothing but trash’.
[UK]J. Meades Empty Wigs (t/s) 443: What you’d call a trailer. Like in trailer trash - is that right?

2. attrib. use of sense 1.

[US]Hanford Sentinel (CA) 18 Dec. 26/1: You can buy Hooker Barbie or Trailer Trash Barbie for your child.
[US](con. 1998–2000) J. Lerner You Got Nothing Coming 50: I’m stuck with the nickname O.G. [...] Kansas and his trailer-trash dawgs have adopted it.
[US]Mad mag. Jan. 37: E! [...] is eagerly exploiting the bloated trailer trash heifer.
[US]Simon & Burns ‘Get Some’ Generation Kill ep. 1 [TV script] You don’t have to listen to this little trailer-trash, whiskey-tango fuck.