I had the same set up you have before i got my fith wheel. They make a drop down hitch that your weight distribution hitch bolts too. I believe i got mine special ordered from uhaul. You wont have to flip your axels only if you want extra clearence on the bottom. Wish i had a picture of mine but i got rid of it already.

 

Owning an 06 28' foot Weekend Warrior TY, I can give some friendly advise. Check your water tanks for being bolted tight. They let them loose on the right side and they bounce up and down. Also check your axle to frame and axle to water tank clearance. I had 1 1/2" clearance and my axles hit the frame and water tanks. I HAD to flip my axles to gain the needed clearance to stop the destruction from axles banging the undercarriage. Flipping will gain you 5" added height. Also check the junk Chinese no name tires carefully for coming apart. Mine had aprox 5k miles on them when they started splitting. They were always run at 80 psi. I put 16" wheels and LT tires on during the axle flip. Mine is heavy. Do not trust the factory weight sticker as WW has been none to flat out lie on the posted weights. Take it to the scales and get a true weight, so you know how to load it properly and can be sure to get right EQ bars. Mine with 500lbs of toys, clothes, food, 60 gal propane, 75 gals of fresh water and equip for 2 weights 10080lbs.
Make sure your truck tires are load rated to handle the additional load of the TH as well