265/75r16 is fairly well available, as everything its variable !
One thing I would say tho , is that you should train yourselves, and have the tools to remove and replace tyres yourself, decent strength tyres will be relatively easy to remove, its the big baggy soft sidewall ones that are the trouble, and you should not be using these anyhow. The harder part is reseating the bead on a tubeless tyre that is narrow on a wider rim . There are techniques to address this as well. Being able to change tyres on rims allows you to carry extra spare tyre without having to carry the weight of a second spare rim . The optimum is start tubeless , with plug kit , this will allow easiest repair (less hard work in hot/cold conditions) , and can often be done without even removing wheel, or even jacking vehicle. You can then get to point of fitting tube, and from there even sleeve and tube if very damaged. Its a balancing act between weight and redundancy and probabilities . Multiple punctures can occur , conversely its not unusual to drive halfway round the world without one (done it  )
HTSH
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