Resistance is the word, I had the same alco, if you just push the lever down and then turn the wheel you will feel no resistance, turn the wheel untill you get resistance then press the lever you will feel the difference.
Kevin reading your various questions ,I take that you do not have the van at home, What is the make and weight of your van , I have like others owned several vans, each van that i have towed has had a different towing experence.
My first van had a boatshaped roof, 2 berth with a rear kitchen, first trip from the dealers empty van was okay, second trip out fully loaded was a different beast.
When towing I go in to lorry driving mode, no sudden twists with the stearing wheel, thats then quickest way to get the van unsettled, Today I tow at 95% passing lorries with no sway this has only come about with very carefull load s within the van, that help maintain a steady trip.When its raining or their are gusty strong side winds slowdown
Its a bit like what Eric Morcombe once explained I am playing the right notes but not nessary in the right order.
I made our first trip amere 12 miles,You can load the van in what you think is correct,but if when you are towing you can feel if the van is unhappy, Since my first trip,I have never ever loaded heavy weights behind the axle to counter balance the nose weights , always over the axle.
Looking forward to many more questions