Only 1 version of SDW arms(standard composite, no graphite), all HD arms(standard, graphite or SDW) are very strong, don't worry.
The standard 1mm trailing knuckle,the axle is 1mm behind the king pin, I think this is unique to Yokomo(touring car). While the in-line knuckles are just like other steering knuckles from HPI, Asso, Tamiya etc. The axles are, well, inline with the king pin. This doesn't affect the width of the front end, but a little of wheel base(1mm, hardly anything).