Is Alan's salary realistically able to support a family of 5?

I just posted a question about where Eric's funding came from for his cross-country trip and it seems like it must've been his parents. I finally saw the episode that begins their road trip and Alan makes a comment about it being to tour colleges (which doesn't make sense either because wasn't Eric already assuming he got in to one and was taking the trip to celebrate going to college? Plus two months before you're supposed to leave for college is obviously a little tardy to be starting your college tour...)

So anyway: For at least part of the time Amy was a stay-at-home mom. The suburbs of Philadelphia are not a cheap place to live. Alan was the manager of a grocery store.... Supporting three kids, evidently fairly comfortably, as Shawn is always accusing Cory of being "rich" and they intended to send both boys to college (and presumably Morgan several years later,) and even funded a cross-country trip for Eric which was to last two months and include many sight seeing tours. Neither teenager had a job during high school.

So how much are grocery store managers making these days??? Bought 250K? (after conversion rates as it was 15 years ago.)