What kind of truck? You can find iridium plugs in the correct heat range that will harm nothing. However, unless your truck is highly modified, this would be an unnecessary expense IMO as it will not provide much gain in performance. The shorty wires are good for their appearance, but again not much for gains.
The 10.4 shorty wires have more resistance than the T-Volts... the 10.4's are only SpiralPro wires with a 10.4" thick insulation... you will get better performance from the T-Volts... and they cost less... check out our pricing in my signature block. If you just want the FAT wire look then we have the 10.4's also... but if its performance your looking for the T-volts are the way to go!