You can hold a tape from the inside of the wheel to inside of wheel and get a good idea if you have a real alignment issue. Mark the spot you measured and move the coach enough to get a 180 turn, then measure again. Should be within an 1/8 of an inch or so. Not sure what the factory toe in is but wouldn't me much more than that. This is assuming your wheels are true which is a good thing to check when you have them balanced. This is how we have checked the Ranch trailers for years. Saved us a lot of unnecessary trips to the alignment shop. If it is bad enough for a trip you will get in excess of 1/4 inch difference and if the back of the wheel is closer you will be sliding the tires down the road and becoming best friends with the tire shop owners. Bearings need to be properly adjusted for this to work which is the first thing the alignment shop is going to check as well.