twin axle mover-Whats best Value please

I don't have a twin axle. I suspect a pertinent question is where do you store. Is it awkward to get into. If access is easy I suspect that driving two wheels rather than 4 might be a possibility. 

will that mean same as single axle then?

How much payload you can afford to lose to it is also a possible consideration.

You will need proper twin mover, even if you go with a 2 wheel one, a singe axle one cannot be used.

Our van weighs in at 1900kg, we have a Truma 2 wheel as we have easy access to our  sloping driveway. It also weighs about 32kg, about half as much as a 4 wheel one.  It does what we need it to do, and with a little shuffling can get the van in and out of some tight situations.

There is a Truma video somewhere on u Tube that shows how they turn and compares a 2 wheel and a 4 wheel turning circle.

The electronics on a 2 wheel twin mover are totally different.

To turn,  the outer wheels move a bit, then all the wheels move a tiny bit to relieve the sideways pressure on the tyres.

Ours is in front of the wheels, so if we lower the nose it helps to take the weight off the rear tyres and reduces the  pressure on the tyre walls.

The van will not rotate like a single axle, the opposing wheels do not go in opposite directions at the same time, so the turning circle is something like 11-12 metres.

A point to watch is how the mechanism is actuated. Basic ones use a lever to get the rollers onto the wheels and these can be very heavy so if you have any health or strength issues they may not be suitable. Far easier are the automatic ones although they cost far more. If you are going for a manual one try it first to see if you are happy with the power needed.

There are also ones using a winding handle which is easier than the lever but you do have to make sure they are on tight or the caravan might roll on a slope.

As for makes we have had three different ones and the difference in performance is not enough to sway the decision for me.

Ours is the TE, probably different models now, the rollers are moved onto the wheels by small motors at the press of a button on the remote, I would not get one now that I had to engage manually..

My twin axle mover (Powertouch) doesn't relieve the pressure on the inner wheels itself, I've to do it myself 

Op - more information needed.

(p.s. You can use more than one line)

Depends on how deep your pockets are