Looks like your rack could be overloaded.. Roof has a rating of 150kg static- for off road use rating is 2/3rds = 100kg
Rack 30kg
Water and containers 45kg
Fuel and containers 25kg
Wheel 20kg
gas bottle 15kg
empty storage box and brackets 10kg
Max Trax 10kg
Shovel 10 kg
TOTAL = 165kg
Please check.