snakes don’t like crossing a well groomed lawn where they can be easily seen so keep your truck in an area that is mowed or weed-whacked.
The first thing I would do is remove any snakes currently residing in the cab. Then move the truck to my garage and find out where they are getting into the cab from. If you find the hole or holes they are getting in from you should be able to fill it with body putty or you can buy aluminum tape. ( Aluminum backed with a very strong adhesive ) This would prevent the snakes from getting into the truck again so you could park it back out in the field.
Hire them, and put them on the clock.
ask them nicely to move????lol????? they like the evironment for some reason. make them not like it…. or find a natural predator and let it go….lol…