Have the seller complete repairs. vs. go to underwriting again to rework it. Sounds like the lender has given their answer, so its just a question of whether you want to accept the delay. But it sounds like whether you do or whether you don't, there is a crinkle in the cotton. If the repairs can be completed to satisfaction in short order by the seller, or it takes another week or two at the underwriter and it only delays getting the park in your hands a couple weeks later (in theory), will it be an issue when all is said and done for your new property?.. just food for thought.
Is the money you need for repairs above and beyond what the seller was willing to fix? Could the list of repairs you would like to accomplish be completed through taking out a short term loan that you acquire after closing specified for repairs..or maybe do your list piece meal over time with revenue after debt service.