I second what Daveb is suggesting as the next step. If you follow his procedure you will confirm if the van battery is ok or if it's developed a short internally (bad). My house battery at the end of it's life behaved exactly as he described. The charge amps would go down and then rise again with the battery getting warm on one cell. Once its confirmed that the battery is ok THEN dive into finding the phantom load.
I'll also second the idea that there could be two things going on. A) that there is a phantom load drawing from the van battery and B) that the van battery has developed a short due to being cycled so low, 9 volts and back up a few times is pretty harsh. So confirming the van battery is ok would narrow it down to maybe just the power draw somewhere.
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2005 SMB RB 4x4 6.0 PSD
A rocket on the pad is safe,
but it's not what rockets are built for.
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