Velcro straps can be very useful securing all kinds of stuff around your RV.  I have found the 15 inch size to perfect for about everything.  I you need a shorter one just cut it to size.  I don't remember how many come in a package but at least half a dozen for $5.00 from Home Depot.

Keep those extension cords under control.

Same thing goes for water hoses up to 25 feet with the 15 inch strap.  You will need a bigger strap for hoses that are longer.

Here I have used it to secure a cable to one of my awning arms.

This is my 5th wheel electrical connection to my truck.  Once on a very foggy morning I was stopped by another driver to tell me my trailer lights were out and he almost ran into me.  I had checked my lights before leaving but somehow the plug came loose.  On that occasion I fixed the problem with tape, but since then I have fitted the cable with one of those straps.  That plug will never come out again when traveling. 

After parking the RV this is how I secure the trailer electrical connection cable.  Also just to the right you see another little red strap hold up a weed whacker.