they always refer you to the 235 x15 we know this is 2 inches to small. so 1870 x 4 is 7480 at 32 psi. on your Hearse that should be OK. it will be on the Seville to. but Richard better run his high top across the scale. then figure in the safety margin if you get the weight all over on one side. 35 psi would up it to 2000 each.thats what collins did on the 89 6 door we had they added one more psi to carrly the load.