OP hasn't posted to this thread for two months now.

I'll add that while I really like the thread insert idea (especially if it is stainless), but it just occurred to me that on a Response it should be pretty easy to get to the problem. 

As a rambling thought, I would also consider cleaning the hole really well and using a torch to braze a little brass in the hole and then rethread that.  That would give a very long-term solution also, but I do wonder what the heat would do.  Preheating the area a little would prevent cracking, but is it possible to warp the block?  Just a thought.

1 hour ago, dlb said:

There have been many discussions on this board about towing with a vehicle that is not rated for the weight of the boat and trailer.  The common points that come up are yes you can do it and if you get into an accident you are probably on your own.  Read your insurance policy before you proceed.  You are most likely out of compliance, they have the right to void your claim and policy.

 

 

Unless there is a specific policy exclusion for towing over the manufactures weight rating in an individuals insurance policy, it is absolutely untrue about your insurance being voided. 

Your insurance is there to cover you in an accident, even if what your doing is stupid or illegal. Think about it. If you get into an accident due to excessive speed or because you were drinking you are covered. 

And in the vast majority of states, the manufactures weight rating isn’t a matter of legality. It is simply a compromise between their marketing team who wants to advertise a vehicle as “best in class” and the accuarials who want to limit warrnty exposure. 

9 hours ago, roeboat said:

Since he is pulling for such a short distance I don't think he needs a very big SUV. Any vehicle with a capacity of 4,000 lbs and decent power should be fine towing for 2 miles.  When we bought our Response LXI we towed it from Tennessee to Michigan (550 miles) behind a 2011 VW Routan with front wheel drive and a towing capacity of 3,500 pounds with no problems except bad MPG.  With the boat, trailer and a full tank of gas we probably weighed  4000 lbs.  It had plenty of power to get it up the hills and the surge brakes + the vehicle brakes stopped it no problem. I don't recommend this van to pull your sunscape but my point is if you drive responsibly you should be able tow with any vehicle with a capacity of 4,000 lbs and decent power (280 hp). Especially since your only towing for 2 miles.

Is a sunscape 21 that light? (4k)  My 2012 VTX is around 6K on the trailer, which is a pretty big jump over a 4K capacity

There have been many discussions on this board about towing with a vehicle that is not rated for the weight of the boat and trailer.  The common points that come up are yes you can do it and if you get into an accident you are probably on your own.  Read your insurance policy before you proceed.  You are most likely out of compliance, they have the right to void your claim and policy.

37 minutes ago, Eagleboy99 said:

https://heatercraft.com/collections/marine-heater-parts/products/low-idle-wyes?variant=37946054347

Sheesh!