The Raleigh 20 will support some very large framed people but they are not a quick or compact fold and stock models generally need some upgrades to the wheels and brakes.
The P20 is rolling on some Suzue hubs laced to 36 spoke Rhynolites and the only wheels I have built that might be stronger are some 48 spoke 26's that were for a guy who curbs out at 320.
But he could ride on my wheels and I would never have a worry about them.