The DE Speedline +3 are the best +3 wheels if you're looking for a bit of added width. They do not rub at all.
The DE +3 Borrego wheels work well also, but they have larger inner ribs that rub the Rear A arm when the wheel flexs. The rubbing eventually wears a flat spot on the end of the Arm.
JConcepts Hazard +3 wheels also will work.
The +3 width isny per wheel. It's 1.5mm per wheel extra width designed to make the SC10 4x4 wider. When using them on the Tekno, they make the truck a few millimeters wider than when using the SCTE wheels that are recommend. I feel the added width helps alot with stability, less traction rolls and you can drive harder. But they are not ROAR legal. It's hard to pass ROAR tech inspection with SCTE wheels, because the rear toe and camber can easily put you too wide. They're rules suck.