Ok, maybe one of the more builder people here have an idea?

We have a spring wheel on the back of gate, at the end. Like you do...

Gate is about 2.4m wide and 1.7 high...weight about 50/60kg.

Wheel rated for up to 100kg.

Gate open,  the drive is slightly lower that side than when gate is shut.  As drive slopes to one side a bit.

So, you pull it shut and the wheel compresses down, taking the weight, right?
But it doesn't. It just drags, and watching him do it, the gate tips at the top a bit.

I thought maybe it needs a wheel each side, in same place? Put a bolt right through to hold both of them?

He says it should work like it is, can't work out why not.The spring is not being pushed sort of thing.