If you haven’t done so yet, check out the facebook group called “Box Truck-to-RV Conversions”. Find the search icon and type in topic such as “roof” or “translucent” and see what other people have done.
In my opinon fiberglass translucnet roofs are a problem waiting to happen. They are brittle and can develop cracks and/or pin holes, especially after setting out in the sun for years getting hit with all the UV rays and heat. A lot of people just coat them with some kind of RV Roof Coating, however, for me, I am planning on replacing the translucent roof with a roll of aluminum metal known as an “aluminum coil”. You can replace it yourself if you are mechanically inclined along with some hard work, or have a semi-tractor trailer repair center do it for you. You can also add more roof “bows”, (the metal ribs that hold up the translucent roof), to increase support for the overall roof, which would help if wanting to walk on the roof or add equipment such as roof top air conditioners, etc. Also, you might want to check out this youtuber, “Chuck Cassady”, and his approach to converting school buses into living spaces. Even though he is converting school buses, you can utilize a lot of his well thought out practices in a box truck. Especially when it comes to framing and insulation ideas. You might want to look into Spray Foam insulation instead of Prodex.
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