Battery Drain

When visiting one of our sons and his family the driveway grade is pretty steep. To level my TT I need to put cinder blocks under the tongue and front stabilizing jacks raising the front high enough to level. I of course will chock all four wheals but I'm still insecure about rolling forward to settle against the chocks when disengaging from the hitch. I was thinking of pulling the breakaway pin to hold the trailer until I read the posts in this thread. Any suggestions or ideas to reduce the movement as the trailer settles in? Thanks in advance for your help.