My first Triumph could charge from my Optimus V cable. That Triumph died, and my new Triumph will not charge with the Optimus V cable, but fortunately it came with a second charger and cable, so I use that now in a second location.
The Optimus V charger works fine when used with the Motorola Triumph cable.
I have been able to charge my Triumph from a 3rd party car charger and cable, but it doesn't seem to make as reliable of a connection as the stock cable, because sometimes I have to move it a little to get it to charge.
The issue seems to be with the cable.