Wow , nice unit ...
I hope we are going to see it for real at Fraser in July / August ?
Back to the seals .... I have made some success with the rolls of adhesive soft rubber from Bunnings , and yes you are right , over time they become too thin to work any more and need replacing , but I guess it all comes down to your tailgate catches . If they are the adjustable ones , well then yes put some rubbers in . But if they are fixed , like mine , any seal makes it very hard to put the pin in the latch ....