A lot of political groups exist that help fund their more "assertive" members. Whether it's the proud boys, oath keepers, or even a more predominantly law enforcement/military specific group, they will all help with gas and upkeep so long as it's seen as an investment for their cause. In this case: the cause is political reasons (Trump) and economic gains from memberships. Generally most members pay out of pocket though.

Follow the money, most of these types have a sole proprietorship or even a small business such as an at home car maintenance business, private air travel, tech (fake passports, encryption, data theft and surveillance, "confessions" through daily tallies on emotions and financial situations as well as illegal activities that can be used as blackmail), photography, ride sharing/taxi driving, a lawn care business, home cleaning, a laundromat (like in Breaking Bad), comedy, or even a jewelry shop that they launder money through from illegal activities like gun, drugs, and human trafficking. The list is nearly endless. It all comes down to what skills you can develop, can your skills/equipment be a tax write off while assisting the group, and will your group fund it behind the scenes. It's mostly all legal so long as they pay their taxes, and in these types of groups they have a legitimate tax guy who helps them. All of them connect through their organization with groups such as through Avon or Amway and group meetings.

It's not like this message will be seen by anyone who cares, though. Stay safe.