What’s the difference function wise. I’m aware of the physical difference with a Pusher being in front of the drive axle and a Tag behind but what makes you choose one or the other ?
Tag axle for grip ( if you’re going off main roads) or Pusher for stability i(f you’re staying on main roads )
Ahh right, always wondered why the Biomass trucks had Tags instead of Pushers.
Cheers 
Spoke to a Volvo guy at their Warwick HQ last year whilst looking at the new FH - he said the traditional preference in Sweden for a tag axle is now going towards pusher axles. Couldn’t say especially why, but that’s how the sales were going.
hiya… you have to be aware of tag axle units in tight places as the lights and mudguards can stick out from
the trailer when manovering. centre lifts axles make your wheelbase longer but the width is constant.
i had a mate on tanker work and said his tag f10 was a pain in the backside.
John
tag for me every time
4x2 for everything
viewtopic.php?f=2&t=63955&start=30
Is a good thread, I have it saved in favorites 
A lifted tag on the motorway is a pain. A pain in the balls to be more precise. I could never drink a cup of coffee without spilling it in my lap! much prefer my mid lift now!
happysack:
A lifted tag on the motorway is a pain. A pain in the balls to be more precise. I could never drink a cup of coffee without spilling it in my lap! much prefer my mid lift now!
I did ask when I bought mine if I could just run with it down when empty to improve the ride (I know nothing) the sales guy said ‘its just not done, tyre wear will increase’, having done a few miles, I will risk the tyre wear 
I had an MAN with a very high lifting tag. Used to tip at Carlisle, grab a coffee at the truck stop (sorry bob) then leave the tag down until coffee was empty on the empty run to Lockerbie/Moffat!
Evening all,
A tag with a diff lock is possibly the best compromise between traction & maneuverability.
A 2.9 meter wheelbase is preferable to a 3.2 meter wheelbase as the shorter wheelbase overcomes many of the steering vagueness associated with a tag axle setup as it allows more weight to be put through your steering axle.
As mentioned before they do have some drawbacks, especially when coupling up and turning on uneven gradients as they can foul the lift axle mudguard tops on the necks of certain trailers.
A driver certainly needs to keep his wits about him and they can make for a bouncy ride when unladen.
Having said all that they would be my preferred tri axle tractor unit.
Regards,
Bill.
I was speaking to carryfast at church on sunday and he said that a double drive (we call them bogie drives here) is the only way to go. Can someone confirm this please.
A pusher axle is a “live” axle used mainly on 8 wheelers with a power divider fitted between the 3rd and 4th axle.
A tag is just and old beam axle to spread the load across the bogey.