Tire rotation question-mixed size problem
 

NEED HELP QUICKLY! New to the forum. I bought a used 2000 Blazer LT 4WD last year and when I went to rotate the tires...I noticed that 1 tire in the back was a P235 x 70 while the other back tire is a 235 x 75. On the front...1-235 x 70 and the other is 225 x 70. Can't afford to replace right now but can I or should I rotate? Upset that I did not see that at the time. Plan on making a 2000 mile drive next week. NO 4WD will be used. Need some sound advice without having to spend the money on new tires. Thanks!
Ed

if i remember correctly, that just means the width of the tire is a little more. so, the tire might be like a half inch taller, i would check them out tho, if it isnt very noticable when you are driving and especially steering, then i would assume you will be alright. but thats just my assumption