You might consider talking to a title officer before you get too close to your closing date. Title on mobiles is different in Texas than titles on Single Family Residences (SFRs) - especially when there is land AND the trailer involved in a single deal.
As for price, $25K sounds like a decent deal. The last time I looked at a similar deal to this one it was a REO and we were in the $10 - 13K range with the bank. When the next door neighbor found out about it he ran to the bank and bought it for $17,500.
Hope this helps!
-Greg Wilson
"The REI Mentor" -- (http://www.reimentor.com)