Ram picture frame and Reese Slider

Called Reese this morning. They have not heard of the issue I'm having. The tech at Reese made the same suggestion as KansasBill. Insert a shim between the picture frame and the slide rail to see it I can raise the slide rail enough to latch and still be able to insert the attaching pins through the legs. I'll give that a try and see how it works. If it doesn't, I may have to look into a solution specifically designed for this set-up.

Very timely posting for me ... Today, I am mating the Reese 30049 slider to my Reese 16K hitch and intend installing on Husky rails that were in my truck when I traded for it.
The Reese install instructions says my slider must be used with Reese Universal rails!
Not sure why this is?
My suggestions for you include insuring your slider is well lubed: lithium grease sprayed on the leaf spring; and dry spray Teflon lube on rollers and the tube rollers slide on.
If there is interference as you seem to describe, Jimnlin has the best suggestion to call Reese. In meantime, is ithere enough "play/ slop" between slider & rails where it's possible to insert a thin shim between slider feet and base rail, of course still being able to insert the pins? ( my directions says to orient pins such that handle is on inside and clip is outside to allow slider travel)
Good luck!

Edit -- corrected slider p/n is 30048
Edit2 -- Correction ... I should have said: The Reese install instructions say my slider is designed for use with Reese rails.

Some one may have input for you but Reese 1-800 will be the best place to find out what you need or don't need with that setup.
Also check their online website.