As far as jobs go, you could babysit or walk dogs or something like that, I don't know how old you are so I can't say to get a part-time job somewhere.
I'm on a showteam too! It's just a little one though, just 7 of us right now (two in walk-trot, two in 2'3" hunters, three in 2'6"+ jumpers.) We don't compete very far away (farthest is two hours.) but we are fairly successful on the local "circuit". Since we don't go to many shows, everyone pays their way (entry fees + coaching fees). You're going to have a blast, I know I am! We have an RV, but much littler and a 5 horse trailer.