You can always edit your post by clicking on Actions, then Modify. With the 800 set on B1 any additional weight or size will push it closer to a re-clocking. IMO they really should have come clocked to C1 to start with but.. I would stay with not more then a 27". Any 6-8ply will be much heavier as is anyway making it likely you will want to re-clock anyway. If you want to go square then you will need all tires the same and all wheels the same as well so 27x10x14 is a good size for both the EX and the Trail. The wheels all need to be the same width and offset so either all 7x14s or all 8x14s. The offsets for all IRS suspension must have the first number larger or equal to the second number, not less. This is the inset. So for a 7" wheel, look for a 4+3 or 5+2. For an 8" wheel look for a 4+4 or 5+3. All in a 14"and 4x110-10mm lug-centric pattern. As for tires...well finding something that's good on pavement and off road will be a challenge. There are lots out there. The good news is that with the 14s, you can also run any DOT approved LT tire as well.