[GCncsuHD]

To me, it would be more than worth it to spring the extra cash for the correct tires. Do it once, do it right. If you are on that much of a budget, consider finding used tires of the correct size and rating, or keep the two good, put them on the back, buy two LT245s for the front, run that for the trip, then once you are there, and your budget is in better shape, buy the other two.

As far as 245 fitment on a 8" wheel, 8" is the upper range of the "recommended" fitment for most 245s, but is still in the range. It will be perfectly fine, the guy setting the beads on the tire may cuss you for a bit, but other than that there will be no issues. My wife's car has been running 245/75R16s on a 16x8 for almost 50k miles now.