Jeez, that's a tough one!
I have no idea about the trailer and I'd struggle with the Landy however prices for these currently are still keen. The fact it's got a galv chassis is a big bonus to some and not to others. The odd issue isn't really going to make a huge difference to the price.
I'd value it between 6-8k however 2 people wanting the car and you never know what can happen.
good luck with the sale.