I am just getting started with an older MH and have no intention to ever go full-time. However, I worked as a Computer Services Manager with the U.S. DOJ and taught "Computers for the Construction Trades" at a large technical school. I have iPads, Notebooks, and Desktops. I do travel about 850 miles to our other house (out in the GA woods) where I have to depend on a cellular hotspot for internet. I am there several months a year.
Much of the answer to your question depends on what you do, how many hours you do it, and personal preference. Typically (assuming you are not a Mac person) a person will find a 17" laptop PC with an i7 processor to be as capable and very similar to a PC Desktop. Even a large 17" laptop takes up little room slid into a padded backpack. You have the option of a standard screen or touch screen that functions like your phone. It is large enough that you can use it to view movies and stream content using a phone or dedicated hotspot.
The alternative is an iPad with a keyboard and mouse. They are somewhat smaller, operate as smooth as silk, and are not likely to lock up and need a reboot more than about once a year. You can get 4G built right in so streaming content or being connected to the internet is simple. They are also far less vulnerable to viruses. They are of course touch screen and fully functional without an add-on keyboard. You don't mention whether you want a small printer or will do without.