Loading two sportbikes into an '05 Tacoma is not a problem. I do it on a routine basis when we go to the track. My wifes F4 and my 954 fit side by side, no problem.
I use Sportchocks, one pushed to the front of the bed and one about six inches back to so the clip-ons don't hit each other. I cut a slot into a tennis ball and push that over the clutch lever on the F4 as it sits only about an inch away from the 954's fairing. Usually this is just a precautionary measure as I've never had any problems. Two tie-downs, one for each bike, pull the bike forward, once again, just a precautionary measure.
I've never had any problems with the tailgate, and that's with using two ramps, one for me and one for the bike, as I walk it up into the bed. So, that equals one wet 954 plus my 200lbs. A five gallon gas can fits in the front corner of the bed by my bikes front wheel. Ramps slide in between the bikes, and my toolbox sits just inside the tailgate extender in the back corner, plus a crate with a bunch of extra junk.
The truck has a 2.7 liter 4-cylinder with a 5-speed manual tranny. It works, but if I had to do it over again, I'd get a six-cylinder. I just wish they'd make a six with a manual trans.