I have 235/85r16 Recips for off-road use and they are quite noisy at around 30-40mph on tarmac, but great in the mud. Be careful of the speed rating of them if you are planning to use them all the time.Size wise mine were spot on 32" so those would measure 29". No probs fitting in the arches on that size.I would be tempted to find an extra cheap set of rims and put 30" muds on them and keep your stock wheels for daily use. You'll find a GC bottoms out loads with 29" tyres.
http://www.camskill.co.uk/products.php?plid=m64b0s229p59574have run these on an XJ, quiet, great on tarmac, really good in mud, & cheaper than recips