not been funny mate but thats your own fault , you have failed to put waterproof covers and boot liners in your car , you cant have been taking care when lifting trolley and containers in and out ,
and you have clearly been illegally overloading your car with to much weight

I have a 5 door suzuki grand vitara 1.9 ddis big enough with a good suspension to handle the weight, I have waterproof matting plus 2 large boot liners to line the cargo area NO probs with water at all nice and dry , But i can roll the seats all the way forward and dont have to put anything on the rear seats as these are folded forward
my pole is placed inside a padded fishing rod sleeve when inside vitara so i dont scuff the interior never had any probs in over 3yrs , I have had 2 other cars in the past but its about been sensible and not overloading , but vitara is a workhorse for me i can carry 10 containers , 250 ltrs no probs
Overall with all my other bits of kit as well and a good amount of fuel in tank i am carrying 350kg at times well within payload .