My fuel tank sits on top of a sliding wooden panel which is about 4 inches below level of rear floor area (below panel is access to bilge pump)the fuel tank sits nicely in there but should I be trying to secure it with ratchet type nylon straps over length and breadth of tank, I can imagine when tank is full it may not move much but might start to jump out of position as fuel gets used up, or would it be OK just sitting in position, if it needs securing what would be best method of holding to floor area (eye bolts) any advice please JBD