Thats one of the main reasons I mounted my spare internally.
Finally getting my Raslaar bar fitted on the 26th of feb along with some
new 285 BFG ATs
first up how would you mount it and be able to access the door handle
TBH i dont think its doable
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As for weight I just weighed my 04 OE mag with a 285 muddies
and it was 35kilo, so thinking a jerry full would come in at 25 kg
both big weights, how about something coming out of your tow hitch
assuming youre not towing, would be easy to manage IMO