I'll try and help. The Camping world link is a Roadmaster brand hi-lo hitch as they call it. See here https://www.roadmasterinc.com/produc...itch/hitch.php
As I suspected, that is made for towing a car/truck etc. behind a motorhome. That application has a large pull (tow) need but the tow bar for a car etc is very light. There is very little tongue weight in this application. The 10,000# pull rating hitch is rated at 400# tongue weight which is plenty for a dingy tow bar.
The Hensley is a actual weight distribution hitch and you will be in 1,000# to 1,200# loaded tongue weight with the Henselly and that size camper. Maybe even higher depending on the camper loading.
The short answer, the Roadmaster hi-lo is not rated for what you want to do with it.
Here is an option, assuming you have to have a different shank. You already know Hensley wants $300 for a fixed shank.
A number years ago, Jim Hensley who invented the Hensley hitch and the sales manager had a falling out with the corporate folks at Hensley. They started their own company called Pro-Pride. https://www.propridehitch.com/
And Jim went to improving the concept that they would not let him do back at Hensley. And they made an adjustable shank. See here for their 2", https://store.propridehitch.com/prop...ble-hitch-bar/
They also make a 2 1/2" shank if your truck is setup that way.
BUT, I would call them and make sure that their WD shank will fit the actual Hensley. They would know as Jim made both. This option does not help on the cost, but at least you are spending this on an adjustable setup versus a fixed one.
Another option, not sure how you came up with knowing you have to have a new shank. The Hensley sets up different then a traditional WD hitch and has a few options that are different that "maybe" your existing shank may work with some hitch adjustments.
I would need to know these figures in order to see if this has a chance at working.
1. Make, year and model of truck so I know what this is going on and the suspension in the truck.
2. Look at the receiver sticker on the back of the truck and tell me the weight distribution rating for tongue weight.
3. Is this a 2" truck pin box? or are you using a 2 1/2" to 2" adapter?
4. Load the truck with the needed camping gear and on a flat surface, measure from the ground up to the top inside of the truck pin box with the truck loaded with gear. No camper attached at this point.
5. Have the camper on a flat surface. Level the tongue jack so the camper is parallel to the ground. If you are on a level spot, then just level the camper. This is the towing stance we want to be in, camper level. Once leveled up, with the Hensley in the ball coupler, use a floor jack or wood block and level up the Hensley shank to the ground. The hitch will be all wiggly in all directions so be carefull. Then measure from the ground to the top of the Hensley bar. Need that number.
6. Need to know the offset difference of the Hensley shank you have now? Top of shank that is inside the hitch to the top of the shank that goes in the truck.
7. What rating WD bars do you have?
Please take pics of all this so I can see what you have rather then doing this all from numbers. Hensley made 2 different WD bar adjusters, one with chains and a snap up brackets and the other with adjustable screw jack to tension the WD bars. Need to see which you have.
I know this is a lot of figure it out, just trying to help and I can't tell you if this has a chance of working with out the dimensions. If this is not the way you want to go, then will try and help what I can on other options.
Hope this helps