The concern would be having it become airborne in an accident. Did you have to remove the padding/insulation? That was my understanding with the 245 but my 235 fits fine so the slightly larger 245 should too but I don’t have that experience.I have a 245/65/17 in the back of mine. It's snug though so i only use the nut and bolt to hold my jack. Spare wheel and tie don't rattle at all.