I've hauled my
BX2230 equipped with FEL and BH in a 5' x 10' single axle trailer rated for 3,500# behind my Expedition rated for 9,000#.
My issues were:
--The sidewall flex in the tires causing the trailer to 'bound' side-to-side with irregularities in the road. Very disconcerting feeling.
--To get a decent tongue balance, I loaded the rig backwards with the BH jammed against the rail to the front, bucket all the way over to one side, and the FEL bucket hanging over the rear gate. It was ugly, but it worked.
--Getting decent tie-downs was a real problem. DON'T use straps...unless you have a multitude of possible tie-down points, you'll never get a nylon strap away from an 'edge'. Use chain.
--Even on the Expedition, which has massive vented disc brakes on both ends, two piston up front, I had a difficult time stopping. I would suspect your truck would have a hard time stopping the load in a reasonable distance.
'Tis your call. Personally, I'd be pretty apprehensive. Not about the trailer, necessarily, but with the limitations of the trailer COMBINED with the limitations of your truck...specifically the brakes. If you had brakes on the trailer, I'd feel much better about the thing.
And leave the extension at home. I cringe every time I see one...a bad joke. Whoever invented those should be shot. They're only good if you're hauling, like, a little tailgating BBQ or a couple of bikes...just dumb for any type of actual weight. If I knew you in the real world, I'd PAY you to NOT use it...