Home - Trailers - Machinery Carriers - Extendable Tractor Carrier Trailer Extendable Tractor Carrier Trailer The Dennison Extendable Tractor Carrier has an easy neck to allow easy loading/unloading, and can extend up to 15.8m. FEATURE AND BENEFIT SUMMARY Rear lift axle Extends to 15.8 m – for transportation of longer, indivisible loads Wheel wells in neck – allow the truck to sit much lower on the deck Easy neck – for easy loading Air operated locking pins – trailer only has to be opened to length depending on load Galvanised steel pull out ramps – to allow for any overhang at the rear Tool locker – between chassis and beams at rear Bow shackles in side rails