+++++VERIFIED+++++
I think this is THE best way to Xfer now.
I know this guy's method, it works. I can tell you that from personal experience. If you guys need a good method to transfer any amount of cash within 5 minutes, this is it. When I say any amount, I MEAN it! You name any item on RuneScape, you can transfer it.
This guide is a must for people who want to transfer large amounts of RSGP to another account.
The only requirement I can think of is that VERY little RSGP is needed for the transfer.