Or, yaknow, you actually find bikers work and are awesome for what you get

Your idea strikes me of my army actually that I run, with some decent results (I say decent, I've not won yet and I don't play in tournaments). Bikers and trukkers. While gpfunk mentions Leadership, I have little issues with it. That 4+ cover save I abuse the snot out of and it saves them almost every time. Remember to have a Nob leader with
PK and
BP just in case. Having a good armour save can help prevent the unit running out of wounds fast, and zooming them into combat is where they work best. Trukker boyz meanwhile - you need lots. I run 4 and it's not enough. 5 is probably a good number, but more the merrier. Full squads of 12 with Nob leader,
PK/
BP. Consider some Rams on your trukks and whizz them in. For a
HQ,
PK boss for tank smashing, Ghazz if you want a really good chance of hitting
CC, or a
KFF big mek for a sheilding on the first few turns. I personally tell people not to take koptas since they're not worth what people want them to do
IMHO and bikers do it just the same, if not better.