New rims and tires

Cokertire.com lists 800-14 or a 215/75-14 as a recommended tire size. So you’re good on width as it’s only 10mm wider.
http://www.tiresizecalculator.info/ lists 225/50-18 or 235/45-18 as possible alternatives compared against the 215/75-14.
Biggest hurdles will be the wheel well, offset, and lugnut pattern