I think most fullsize tailgates are conservatively rated at 500lbs in the center. If you are careful, you'll never have the full 750 on the gate itself, it will be distributed to the ramp and bed itself as well. Just be careful where you're standing as that could be the extra weight that makes the difference.
You could always remove the tailgate and load directly into the bed if it will fit and the angles work. That's what I do but I've got sportbikes, light and short.
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Matt
1962 Grand Prix - Cameo Ivory|389 4sp|One-Owner Survivor
1964 GTO HT - Silvermist Grey|389 3x2s 4spd|A/C|Hurst Wheels|Frame-off|SOLD
1965 GTO Post - Mayfair Maize|421 3x2s TKO600|Pro-Touring|
1966 GTO HT - Barrier Blue|389 3x2s 4spd|Red Fenderliners
2005 GTO Coupe - Yellow Jacket|Magnacharged LS2 6sp|543hp/561tq|SOLD
2006 GTO Coupe - Spice Red|LS2 6sp|20k orig miles
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