Good to know we're speaking on the safe wavelength
I don't think counter-weighting the front end is going to help with "handling", only steering feel. And you're right, it may very well hurt handling from increased moment of inertia (about the Z axis). But don't think I'd be slaloming with a bike on my truck...
If you're looking for height, then air springs or Timbrens would definitely help. I find it ironic solid axle SUVs seem to be sprung softer than IRS ones (perhaps to compensate for ride quality). My old Xterra was almost on bump stops with a YZ250 and gear!
So you have a Moto mule or MX hauler style carrier? I'm looking to upgrade to one as well. Got a cheap ramp style one for now. Works okay, but if the bike is not strapped down real tight, any bumps can cause a secondary oscillation as you essentially have two suspension in series. Bike's been thrown off the carrier twice.