I say, and with God's success: The combination of prayers for travelers according to the Hanafi school is as follows: They should pray two rak'ahs for every four rak'ah prayer, and no increase is allowed beyond that. As for combining two prayers, the original principle is that combining is not permitted according to the Hanafi school, but it is preferable not to be strict on this matter due to the fitna (trials) that may arise from it; because the opinion of combining is well-known, and people do not pay attention to praying while traveling. This is also the opinion of other schools of thought, and it has been chosen by some of the later Hanafi scholars. The matter is broad, and God knows best.