tires

I have a p30 chassis with 8r19.5 tires.I wont to leave the 8r19.5 tires on the back and put wider tires on the front.Will this create any problem for me.If not what wider size should I go with on the front.Also can I put two different brands on the rear.I recently bought two goodyear tires for the front.I wont to take and put them on the rear along with two double coin tires.When it is done it will have two double coin tires and two goodyear tires that are all 8r19.5 On the rear. I will have double coin tires that are wider on the front.Will this work.