Maybe someone can help me...... I keep getting different answers about what i need. im looking to add some aftermartket wheels on my trailer. ive got a 03 ranger 521 with a tandem axle with the stock 14"rims 215/75/14 tires. ive heard that its a 5x4.5 bolt pattern and that I need a zero offset. I want to go with a 18" or 20"rim but dont know what exact size or offset or even tire size. help with information and brands of wheels , i wish they had a book for dummies on this subject, I cant figure it out or my local wheel shop,thanks Cesar