Has anyone gone from a 32 to a 33 inch tyre and does the extra 12.5mm really make a worth while difference off-road?

The reason I ask is that I am currently running 265/75R16 on 7 inch rims so this is the largest tyre that will fit. To get the 33's I will need new 8x16 inch rims as well. My camper also has the 7 inch rims with 365/75's so its handy if I need a second spare. I am interested in keeping it legal so can't go over 33 inch (without engineers certificate, and don't plan to).

Pro's - larger tyre which lifts diff's up by 12-15mm.

Con's - need new rims, no longer compatible with camper's wheels, more sluggish take off, higher EGT's, higher fuel consumption?, even worse 1st low crawl speed when going down hills.

I have not been stuck anywhere with the 32's but the diffs do take a hit from time to time. What are peoples thoughts?