How difficult will it be to travel on AP? Also if  someone has a valid H1B stamp on the passport , can he/she  re-enter USA on the same H1-B visa or need to re-enter on AP only in a situaion when I-485 is pending? If the primary applicant is  re entering using the valid H1-B, can his/her spouse and children can re enter using the AP? Anyone sharing their experience  will be highly appreciated. Also what is the recommended advise for traveling to Nepal? Carry both AP and valid H1-B visa or only stamped H1-B visa should work without having any negative impact on the existing GC (I-485) processing?

Thanks,