Your profile says 2005 Jayco Dove??
If it's a pop top caravan then this is some of the issues;
1. Your scissor lift will need to be higher. There for the whole scissor mechanism will need to
to be wider to effect the extra height, that is, a whole new mechanism.
2. Longer gas struts, but attention will be needed to any change in pivot points..
3. Instead off attaching more material to the skirt, it may work out cheaper to get a new
skirt made. Depending on where you are, caravan repair businesses can accommodate that.
We had ours removed and a new one fitted, was too bad a price..
4. Small things like extending the power cables from frame to roof...
Also, keep in mind that wind will have more effect on the skirt. Depending on the strength
of the gas struts you may need spacers between the frame and the top(roof) if you are
going to use a pull out awning for any long period of set up and stay..