The tongue weight can't be much... I can tilt the trailer bed easily when the bike is loaded by lifting on the front of the 2x6s. The car didn't squat either. Bike should weigh about 750 lbs IIRC. I do like how the rear Wing wheel ended up exactly over a crossmember... didn't plan it that way... I mean, yeah, that's exactly how I planned it!
Cool thing is, with the way I attached the rails they can easily be slid aft (merely loosen two bolts!) to fine-tune tongue weight/cg. Max tongue wt was 200 lbs IIRC.