No problem, even with two "latch" seats...
We have a 5 year old boy facing forward in a Recaro Start (uses factory seat belt) and a 13 month old girl facing forward in a Recaro Young Sport, using LATCH and the seat's built in 5 point harnesses.
We've gone all the way back and forth from Philly to Indianapolis in this configuration!
Dave Flogaus CCA #123862
16 F80 M3 Daytona Violet
95 E34 M5 Daytona Violet
13 E70 X5d Tow Buddy