Not sure of your tow rig?
I did this with my 1999 RAM 2500HD, and my dad's Jayco 9.5'
Now I Have a 2004 Lance 920, 9.5 foot long.
I tow with my new to me 2005 Dodge RAM 3500 Single rear wheel.
I bought a 2.5" reciever (Hidden hitch makes it I think) that bolts right on unde the factory 2" reciever hitch. Now there are 2 reciever hitches at the back of my truck,
I made my own extension similar to the one I saw made by Torquelift. Basically it has 2 bars, 1 2" and 1 2.5" that come back about 1.5' then I put a 2" reciever mounted extreemly rigidly to those.
My set up was much more cost effective than torque lift, and I am confident that it is probably more secure. Factory hitch rated up to 10,000 weight distributing and new hitch rated at 16,000, weight distributing. (Though I know the extension doesn't equal the sum of those I know I have plenty of safety factor towing my 5500 to 6000 lb Jeep and trailer.
My GCVW is just at 17,000 lbs.
I also made my camper tie downs mount to this beefier hitch, not the bed, and used Large capacity turn-buckles to help support the hitch extension from side loads. I have pulled a 24' travel trailer behind it using a weitht distributing hitch and it towed Beutifully.
I tow my Jeep and 16' trailer behind it without use of a weight distribuitng hitch and it tows very nicely. I have added Firestone Airbags, Made my own overload spring spacers, and added a Helwig rear sway bar to the Truck and It will roll right down the highway and handles beutifully. Yeah, I have some time and money in it but what part of our hobby doesn't.