They are a larger tyre, is yours an Exec (these are 20mm lower than an SE )?
I think you'll probably get away without spacers on the wheels; but for me I'd fit them anyway 25mm on each corner, they look so much better and it creates space on maximum compression of the suspension; and space on maximum steering lock.
If you don't fit spacers, I don't think you'll suffer more than an occasional rubbing sound of the tyre on the plastic wheel arch liner.
If you choose spacers look for TUV approved imo; HR spacers are probably the rolls-royces choice.
To be safe you should consider mentioning it to your insurers, you could tell them you need them for off-road and winter use.
Never heard of anybody having warrantee issues with oversized tyres.
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Have you consider the above?
They have 3pmsn designation so they are certified for winter use, the BFG KO2 don't have this rating.
We have run nearly every BFG/GG/Cooper AT tyres on our Double cabs over the years. This is our new favourite AT tyre, much better road manners than most; full winter rating/all-season; last along time; and on a 4wd tons of off roads grip.
102 load rating so fine for Vels (not T32's)