I made my tray only 1700 long and initially used my custom canopy from my Hilux
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We then went from touring with up to five back to just the wife and I so to reduce weight changed to this being only 1200 long
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I did this because we didn’t need all the extra room anymore and to get the weight forward with the spare at the headboard, I initially setup for two spares but now only carry one.
I have decided to change again and have just bought a 1500mm long canopy that will sit right up the front of the tray and my spare will sit at the back but still on the tray.
My main motivation to doing this was because it is easier and lighter to support my RTT with this setup and the weight gain between the two canopies is bugger all.
If you have the option with your tray manufacturer get the whale tail locks instead of the T locks. They are a much nicer product and have a compression action against your rubber seal when you close them