Several reasons why they would need drive up access. #1 reason is populated and producing hives are heavy! a large super of honey can weigh 100lbs! Mediums are 50-60lbs when full. Drive up would be very important. Access to the hive is important as well. hives may need to be checked regularly. For health, production, brood, queenlessness and other possible problems. If you can't give them access then maybe having their hives on your property won't be the right solution for you. Keeping a few of your own might be more logical and i guaranty you will find it fascinating and addicting. I will say that you could probably expect a beekeeper that is using your property to respect it, keep gates closed, and be as unobtrusive as possible. It's a win/win for both of you and if he or she doesn't respect your property then you can easily kick them off.