Wanda,
The 9"X9" size indicates that they are Vinyl Asbestos Tiles (VAT), you
obviously don't want to install those in your trailer even if you found
NOS. Be careful while removing and discarding the old tiles. The
industry changed to 12"X12" Vinyl Composition Tiles (VCT) somewhere in
the 70's. Folks are either cutting down 12"X12" to the smaller size or
opting for real linoleum sheet goods.
Rob & Shari Davis
'64 GlobeTrotter
WBCCI #1824, VAC