I don't mean to add more choices but I have the Thunder 330 from II and LOVE it. It's a 62/74/14 I too daily drive and tow a 20ft gooseneck with a off road truck (82 f150 1 tons full cage on 38s). Its not too slow to spool and will handle your mods. The install is pretty easy, all you need is the Hx40 downpipe and its a direct fit. Not too much info out there on these but all I could find when I bought mine were good.