This includes bring the electrical up to code by installing GFCI plugs where needed, replace the fuses with circuit breakers, remove ivy, remove a chimney thats coming apart and replace the less than 3 year old HWT (moving them to the back house basement) and install new direct vent units in the front house, remove a small amount of mold from the back house, replace some composite siding boards that are broken, a few grand for new gutters (very conservative), fix a bay window sill , install 1 set of inside railings, and secure 1 loose porch (owners unit) , but Ive padded this list to 30k just in case because it really is a fair amount.The cost to get the interest rate down to 2% is 8k out of my pocket and 20k seller concession rolled into the loan. 

What would be your deal breakers?

I'd like to hear from experienced buyers/seller on what I should keep an eye out for or potential deal breakers.

Is the low ROI a deal breaker? 

There is usually also a paper sheet inside the trailer somewhere - often it's pasted inside one of the kitchen cabinet doors, but it can also be pasted to the wall near the breaker box. 

That could be a deal breaker.

I would do something like turn off the breakers  at the box outside.

Just get an electrician to add a double pole breaker and run a new electrical wire and plug for a dryer.

Its not a deal breaker for everyone.

The inspector has limited knowledge on circuit panels, grounding and does not want to get sued being wrong.You can eMail to the contractors and start asking them what you want to address.