Yeah the newer version looks like its got more weight transfer options?Because the transport wheels are at the back, you could transfer some weight by not lifting those wheels completely off the ground.
It certainly looks like a far more integrated drill than the Caddy type system, which suffered badly from side slippage when on the side of a hill.
When I bought my mounted 3 metre second hand a couple of years ago, there was a guy South of Oxford with a 4 metre Caddy version for sale. He just could not cope with the side slippage on his banks. This is exactly what put me off buying it and why I went for the mounted 3 metre version, even though it cost more.
Just worried it might be like pulling a dead horse up a hill ! Maybe a tweek on lift arms an back wheels will be OK