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[Rick M]

I go along with NickKent the height of the tire affects stability. I would put forward that 10 ply rated 265 75 16 tires would be more stable than the taller 8 ply rated 285 75 16 tires with the more flexible sidewalls. For that matter, some 245 70 16 tires like is on my dad's truck would be even more stable. Same would go with your trailer tires, moderate sidewall height, high count ply rating equals more stability, tall sidewall height, flexible low count ply rating equals less stability. On the other hand wider wheels, while maybe more appropriate for the wider tires will not make the sidewalls any less flexible.