A lot will depend on the fiberglass construction and how it is braced. Some laminates are a single skin with little or no core material, and as a result, are relatively flexible. Some roofs are braced within the laminate, some are fastened over bows. I have a trailer with a glass roof, that when walked upon, feels like a sidewalk. Others will oil can under the lightest loading. Depending on the relative stiffness of your roof, will depend on how much bracing you will have to add for the weight of an AC unit. An AC weighs in the neighbour hood of 100#. Consider the added weight when bouncing over an unimproved road, and you realistically have to have a roof capable of supporting almost 200# within a 14" square, to be safe. Depending on your weight and how much your roof deflects when you attempt to walk on it, will determine if it has to be additionally braced. I've braced an aluminum construction with wood, a fab shop can make you extra aluminum bows, you might contact the manufacturer for additional parts. You first have to determine what you have and how strong it is. The newer Verylite trailers have an aluminum roof. http://www.merhow.com/vlstdopt.html Gard
Edited by gard 2010-01-15 10:44 PM
|