Putting a hitch on my 2980RL

[jburnes]

Trying to install a receiver hitch on my 2980RL Montana 5er so I can have it tow a small cargo trailer. 1st pic is showing where a frame rail ends at the rear of the trailer. #2 is the frame rail and #1 is an 8-in I-beam that connects the two frame rails. To the left of that in the picture is the c channel they installed to hold up the water tank. I'm needing to know if that 8-in I-beam is strong enough to attach a receiver hitch directly to it to tow 3,000 lb or so. 2nd Pic is from underneath and it just shows the crossmember I-beam as well as the c channel that is holding up the water tank.

I was going to buy a Curt 13703 hitch but the only way to install it here would be to remove the water tank first so you could then bolt it to the frame rails. If I could just attach a receiver hitch to the center of that I beam, life would be a lot easier.