I made $40 to Rushmore last weekend, playing only Loose Caboose and I didn't get one single bonus round on this deposit. I made another $40 deposit the next day, and I played Loose Caboose game once again. I had 1 bonus round with 4 free spins and another bonus round with 8 free spins, I didn't win much on these two bonus rounds, but I had another bonus round shortly after the previous round completed.
I had the red caboose ran in two rows and gave me two wild symbols, I forgot how many free spins I had and the multiplier, but I had the screen shot showing that I won $221 on this bonus round. I played Triton Treasure right after I left Loose Caboose game.
I had two bonus rounds after playing for awhile and booommmmm, the screen flashed, saying that I won a minor random jackpot around $1200. I played till I beat the playthru and cashed out $1050 evemtually. This is the 2nd time I won the random jackpot with Rushmore casino.
The first one was on Lucky Last game, $255 was the amount, but I couldn't make the playthru on this deposit though. I played Lucky Last and Triton Treasure for awhile prior to getting the minor random jackpot, so my guess is that if you like certain games, keep playing it and do not change the games often, you might win the random jackpot, lol.