How many locations needed to support hull?

[tidalwave]

I have a 26M and need to touch up the bottom paint where the trailer
bunk pads have worn away the paint.
I was able to use the trailer lift to raise the bow...placed old tires and a rubber pad beneath the keel...then lowered the trailer enough to clean and repaint the bow pad areas...

But the two sets of rear bunk pads have me worried...

How many support locations do I need on each side?
I am worried about putting too much weight on any one support
locations and creating stress cracks in the hull.
I believe that the temporary supports need to be at the longitudinal
stringer locations, correct?
Can I lift and support just one side while letting the other side rest on the
transverse bunk pads?

If you have done this job...what method of support, locations for the supports, etc. worked the best and safest for you?

Thanks for any suggestions

[They Theirs]

I believe some owners have placed their Mac on cribbing blocks, (Stands or supports) maneuvering them fore and aft under the boat as the trailer is carefully pulled out, leaving the boat clear of the trailer, on the hard, to work on the trailer. The trailer is lowered in the front while cribbing is placed under the stern. Raising the bow will lift the boat off the trailer to be cribbed near the bow then lowered to clear the bunks. Some more experienced may provide better advice.

[Chip Hindes]

I have lifted my X essentially completely off the trailer with a single 5-ton floor jack centered under the CB cavity. No signs of distress.

I would absolutely recommend you not try to lift one side of the boat. That's asking for trouble.

That is approximately the balance point of the boat, though don't jack it from the actual balance point or the bunks still in contact may not hold it centered and you don't want it falling off the jack. A few feet aft and the stern lifts off the trailer bunks; a few feet forward and the bow lifts. I use a block of 2x8 about 18" long on top of the jack to spread the load. Have the trailer attached to the tow vehicle when you do this to keep the trailer from going squirrelly as you lift the weight off it.

Don't get carried away; lift it only far enough to get a paintbrush or roller in in between the boat and the bunks. I wouldn't put my hands or any other body parts in there.

[Dimitri-2000X-Tampa]

I used 3 4X4 jack points to make a nice tripod. Two at the stern under the stringers about 18 inches in from the transom. And one up front just fore of the CB where the hull is still mostly flat. Between the 4X4 and hull I used about a 1 foot long piece of 2X8 to spread the load out on the hull. I had it jacked up there for a couple months and it was plenty stable enough for me to get under it. Of course once you get the whole thing jacked up like that, you may as well do the whole bottom job. For touchups, you can just slide the boat down a bit at the ramp and then leave it a few inches off the snub. I wouldn't drive too fast with it like that though.