Dubai visa on arrival at the border I.e by road

Hello people!
I have a query to which I need your help. I live in ksa.....have iqama with marketing specialist profession. I keep going to Dubai every 4-5 months regularly and have had NO issue in getting visa on arrival at the airport.
Now the thing is this that my father wants to go to Dubai and he has the same profession as I do ....Marketing Specialist. But he wants to go BY ROAD. I have no clue about visa on arrival at the border U.A.E.
Can anyone help me in this regard?

There is no difference.... basically the same... what is your specific question?

Question is that I've heard that uae immigration people do not give visa on arrival for marketing specialist on the border. That's what 2,people have told me. Which I fail to understand as I go twice a year but by air via the airport..... Hassle Free. Is there any site where I can check what profession are entitled for visa on arrival at the border? Coz on the internet its all visa on arrival at the airport only.....no mentioning of by road

Forgot to mention he and my mother are going for the 1st time. They have been to Bahrain and Qatar by road

Well if they have been to Qatar, then i don't think UAE should be a problem either. I don't think they have a website that you can use but these guys at the passport control...you never know their moods !

What happened ? did your father traveled by road? because i also want to go by road and my profession is Sale Executive.