That lools neat as, i like it. Well done.
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Does look a good fit and centralises the added weight.
Probably a bit late but we had one of those for a Simpson/Hay river trip with two kids in the back. Worked a treat, as others have said was a bit of a nuisance when the level got below the hump and I only had a hose on one end. I just lifted it up to move the water. We didn't need to secure it as it didn't move.
Regards,
Tote