Allow it? Hah! Once you get a bit of experience and training, the hard part will be refusing the travel. Field service engineers, and sales engineers practically live out of their suitcases. It is not a bad place to start, seeing how customers use the products the company makes, where the product documentation falls short, and also training staff there. But it is a hard life.
If you show an aptitude for training and a willingness to travel, there are companies that will send you all over the globe. Any large company such as Siemens, Rockwell, GE, ABB, Emerson, etc. will be eager to send you. Many large engineering companies are also eager to have people they can send to a job site. Even many smaller companies that produce parts used globally will need to send people places for technical support.
The problem is finding a job that DOESN'T have loads of travel in it. I have personally set a limit of six overnight trips a year for business. I will refuse to do any more than that because I do not like being away from my family for long. My wife and children mean a lot to me and frankly the hotels, restaurants, and suitcase life get tiresome.