I think Lance is the only one that advocates and sells the struts. I have 'em and they are great! Before I got them, my truck felt like it was on a trampoline or pogo stick as the front/back rock-n-roll motion was pretty significant on some roads where there were expansion joints. After I put them on, things settled right down.
Here's a BIG warning;
Do not drive out from under your camper when unloading without removing these things. I've come close twice now. Seems my attention is directed towards the rear as I unload the camper, not forward where the struts are.