Originally Posted by melissab
So how do you know the 2 ends are perfectly straight/level before you snap the line? A laser level or something? There is some sort of contraption for hanging pix straight, wonder if that would work.
String will make straight line if it's tight (tight string is always straight) but level or square is a horse of a different color. Your trailer must be level front to back to get any level line on the side.
Those pix straight contraptions use a laser light
to give a straight line but have to be positioned level. Some have a bubble level in them but not all. The others assume you did a level line and will position the laser line on your short existing line and the laser light
will extend it. Not sure how well they would work on the curved surface of some FGRV's.
I use a bubble level (3 or 4ft long) to make a couple of marks
that are level then hold the string on one mark and have wife holding other end of string tight move string back and forth just above the surface until it's over the second mark. Then have her push her end to the surface. And snap.
If the line made hits both marks made with level then whole line is level. Of course trailer itself would have to be level when you made your marks for the string to follow.
On a scamp
you might measure up from the belly band at two points about 3 ft apart and make two marks to guide the string. Or some other feature that runs in a straight line. Like the middle seam on the roof of some FGRV's.
You are really interested in having the canopy appear
level so once you have your chalk line stand back and look at it in relation to door and windows
etc. Don't like how it looks? Wash it off with a rag and try again.
You could even consider measuring up from the top of a window to get two marks. If canopy line visually matches the top of the window line and the window lines up visually with the the top line of the door , then it would all look level.