I only appear to have one at each end and it looks like there should be 2?

There are 2 sets of lugs at each end so I thought they should both have springs on and my attention was drawn to it because one end dipped slightly.

I have two springs at each end of my 2007 Triton 430. 4 in total.

Picture for you.

springs.jpg - Bild entfernt (keine Rechte)

At a guess I would think that smaller roofs need only 1 spring and the larger roofs need 2.

Oh come on JohnE, don't let logic get in the way of a discussion

Hope and roofs spring eternal, Ray.

Back to the original poster, williamte, which model eriba do you have?

As you are having trouble with the roof lifting, you could probably fit an appropriate spring yourself, not necessarily a genuine (expensive) Hymer one.

A gas strut conversion would be a lovely thing!