I can help you with that one too! It had a rare full sleeper cab (a sort of rabbit-hutch plus!), a 250 Cummins with Jake-brake, Kysor air-on on the roof and all sorts of refinements - I don’t know if it had a night-heater though, as they weren’t very common in the '70s.
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Pure luxury
We do it, but the machine operators compact a pad for vulnerable trucks and push the contents away.
Yours are not different, I have never seen one like that with all trailer wheels still on the ground. I liked them and they had a special, unintended quality. If having lost traction after tipping, by judicious use of the trailer brakes, and unit brakes alone if needed, you could ‘walk’ your way back to firm ground. 
well it helped that Eric Vick’s M/E fleet was meticulously well maintained!
Simply out of interest, are both Eric Vick and Biffa still going? 
Biffa are one of the biggest waste operators in the UK. The waste industry must be one of the most corrupt industries over here but Biffa are not included in that . They seem to do it right god knows how but they do unless someone knows different.
Eric Vick has gone. Richard Read went a short time before it. Passing of an era.
The only truck I drove that, that could be done with was specially plumbed for the truck to remain stationary while the trailer moved forward. I still don’t know why they complicated the issue. All we had to do was blow chicken feed into silos. As that required connecting the trailer to the silo by way of a hose, keeping the trailer stationary would be easier than specially plumbing the truck.
Normally, application of the parking brake applies all spring brakes (ie all wheels except steer). The tractor protection valve prevents air going to the trailer, so with the park brake relased, only the prime mover can move. The same can be achieved using the trailer brake handpiece, where fitted.
Where’s “over here”, Ramone, USA/Canada? I always assumed you were in the UK.
Thank you, and also @ramone, I half expected the truth of it in both cases. 
Not sure if that is what I mean. I never had to do it, but did experiment once the idea came to me.
Send the body up to the top in the normal way with trailer brakes off, tractor brakes on. That draws the trailer towards the stationary tractor.
Then, with trailer brakes on and tractor brakes off, lower the body.
As the body descends, unable to push the trailer backwards, the weight of the descending body pushes the tractor forwards, and thus out of the sticky bit.
If still in more sticky bits, Repeat until FREE
And fingers crossed to avoid lying down on your side. 
That’s the bit we can’t do, normally.
@SDU The question from Spardo was are Erick Vick & Biffa still going , Les answered the Eric Vick bit and with both companies operating in the UK and Spardo being in France i said over here which is the UK .
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@ramone thanks mate, it’s reassuring to to realise I’m only fading, not completely gone. 
Too much Fosters
I’m not that desperate. 
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But that’s the point normally with that setup. When tipping with the normal method you have to move forward as you are tipping to allow the product to lay out along the ground. With this method the tractor remains in place while the trailer wheels, pivoting over the last axle (the only one still on the ground) are drawn towards it by the body going up.
The one in the picture is new to me with the trailer bogies remaining on the ground and the tip is to one large pile or to a silo for example.
The ones I used were built in the NE of England by the same firm that made car carriers. Not sure of the name but I think it began with D but not sure if it was Dyson or not.
Although they didn’t look it with all but one axle off the ground they were supposed to be more stable than the normal artic tippers with only the body going up. This picture appears to be a mix of the 2.
Come on somebody, help me out, someone other than me must have used then one time or another. 
Could it have been Carrimore ??