Irony: The number of members recommending a fifth wheel with more tongue weight compared to a travel trailer. Even though the OP has stated that a fifth wheel will likely put him over his cargo ratings.
Granted, some fifth wheels will likely hit his cargo needs, but very few fifth wheels will be as light on the nose as the travel trailer will be.
Regarding the OP's question: Get the TT you want, and spend the money on a good PREMIUM hitch. A dual cam or equalizer, or a used Hensley arrow/propride (watch craigslist, they can and will show up on there). And yes, a 10,000GVW trailer will likely be more like 1200/1400# tongue weight, according to trailer layout.
With a premium hitch, they pull just like a shorter trailer. They do require a little more care when backing into sites, but other than that they are just fine.