Abstract: A device for logging trailers which have telescoping reaches providing for adjustment of the length of the trailer reach. The device is an expandable compressed air chamber positioned within the inner reach near the end contained by the outer reach. Four shoes are retained in contact with the expandable chamber. The shoes are provided with friction material adapted to contact the inner walls of the outer reach through openings in the walls of the inner reach. Compressed air is supplied to the expandable chamber through a hose from the truck cab. The truck operator is able to lock the inner reach relative to the outer reach at a desired length by control from the cab.

Abstract: An attachment for logging truck-trailer combinations which have a trailer reach and sliding compensation means allowing the trailer to move freely longitudinally in relation to the truck, acts to prevent separation of the truck and trailer, and hence stripping of the load therefrom, under highway upgrade or mire conditions. The attachment comprises expanding friction brake means configured to fit within the trailer reach and connecting means to join the expanding friction brake means to the sliding compensation means. Positioning means positions the expanding friction brake means for releasable, frictional, braking contact with the inner walls of the trailer reach and brake operating means allow the operator remotely to activate the attachment to prevent separation of the truck and trailer when conditions tending to cause such separation are encountered.