Atlas Model Railroad Co.
MasterLine(TM) 45' Pines Semi Trailer Assembled

TC Reimlinger Tractor Supply (white, red)
Walthers Part # 150-12231, p. 684 Walthers 2012 HO Scale Reference
HO scale, $15.95, currently in stock at Walthers but is scheduled to be Phased Out

 
Each 45' Pines Trailer includes two landing gears (fully extended or retracted), rubber tires and prototypical lettering schemes and numbers.