10 ply A9 crossply is what I read.
Back to your question on crossply v radial.
Those oversized crossply tyres on smaller than recommended rims will be slightly more balloon shaped than on the rims they are on, but should be ok.
Moving from radial 16.9r30's to these you will find a drop in traction, on greasy surfaces and with light loads the wider harder crossplys will spin or slide a good bit easier, with heavy loads or on wet ground the wider tyre should be better. You may find the crossplys less comfortable on the road, but there are a thousand other variables, so won't let that be a deciding factor.
For me it would come down to what type of ground you work, if you have slopes and reasonable heavy soil stay away from large crossplys, if you have flat soft boggy type soil they will be an advantage.