Would a crossover between Diff'rent Stokes and Good Times would have worked out in 1978-1979 i can see the drummonds going on a vacation trip to chicago and get lost along the way and happen to bump in the the evans family by accident and they become good friends.

http://www.youtube.com/watch?v=0KflQ5--uSY
http://www.youtube.com/watch?v=RGJRkTIZAmQ
http://www.youtube.com/watch?v=1cVcLoAjqHw