For short term you can just switch IP and use fresh account, keep it 1-2 days and you're normally fine. Additionally doing it when Jagex are likely out of office is also a good idea. RWTing while using your main is risky business, I recommend you do MAIN -> Throwaway -> Buyer/Seller to be alittle more safer.
I've had times where I've sold some GP to a gold site and shortly after get a RWT ban. I've also had it where I've bought and got a ban shortly after. I've lost probably close to 1BILL with RWT bans and they always for me seem to happen when I use a mule too frequently within short time periods.
Using mains is much less risky but I wouldn't use main if I don't plan on holding the gp for more than a few days.