Sorry to be asking so many…
Fifth Wheel Heights. I’ve been offered some work pulling the odd load in an urban curtainsider (950mm fifth wheel height). Other than looking a bit silly behind a 6x2 on a standard fifth wheel height, is it safe to assume I can still hook up to this type of trailer?
Distance from pin to legs could be a problem? Will the trailer legs hit the unit lights?
Depending in unit configuration will trailer chassis hit mudguards?
If a multi axle trailer what is max specced 5th wheel height? (Picture a short trailer behind a tall unit- front axle hanging in the air!)
You’ll probably need a sliding 5 wheel set right back. Best try it out rather than rely on tape measures.
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Franglais:
Distance from pin to legs could be a problem? Will the trailer legs hit the unit lights?
Depending in unit configuration will trailer chassis hit mudguards?
If a multi axle trailer what is max specced 5th wheel height? (Picture a short trailer behind a tall unit- front axle hanging in the air!)
You’ll probably need a sliding 5 wheel set right back. Best try it out rather than rely on tape measures.
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Those were the kind of things I was scratching my head over to be fair. I’ve been told this customer has two lengths; the single axle 24’ bed; and the twin 33’ bed.
So it wasnt a bone question after all…thought the title was about bones

It is not just the lights, wings and landing legs which may foul, but look underneath the trailer as well, the run up ramps or even the end of the chassis can easily foul the swan neck on just the shallowest of gradients - and that is with the fifth wheel slider right back. You may have to unbolt it and refit it further back. Although less likely the trailer rubbing plate may foul the catwalk on the opposite gradient.
As an additional comment, from your other post, a tag axle unit will likely have the fifth wheel further from the rear of the unit and especially if tag raised will more likely foul trailer.
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Cheers chaps, food for thought…! 
Can’t do any harm to swing by the potential customer when passing, have a careful hook up and drive around the yard with one, a poke nose underneath when stopped on a turn and you should be able to estimate how close or not the trailer chassis/legs will get to your tractor should you encounter dips and undulations at entrances and junctions.
I’ve known all the advice from makers/converters prove as much use as a chocolate teapot when the time came to hitch up, not a hope in hell, you never know for sure till you actually try it out.
I asked a similar question regarding a single axle Tesco urban trailer we had to pick up a while back. In the end it went on a 6x2 with the fifth wheel slid right back but it looked bloody daft as the pin is very shallow to the headboard you could very nearly reverse another truck between the back of the unit cab and the front of the trailer when it was coupled up kind of defeating the object.
Unless trailer manufacturers are in cahoots with unit rear light lens manufacturers I can’t understand, particularly with fleet spec ones why they don’t ensure they can go behind a 6x2 unit with the fifth wheel in the usual place. Possibly it could mean the landing legs are too far back then causing an issue with loading uncoupled I suppose.