Raising the trailer

Be aware that lifting the trailer will increase the frontal area, thus increasing the air resistance and decreasing the fuel mileage.

I didn't see it mentioned by the OP or by anyone else, but if your existing axle is a drop axle, a great way to get about 4 inches of lift is to simply replace it with a compatible straight axle. Just about any Dexter axle can be converted from drop to straight. If your current drop axle is underslung, it stays that way (no flip) and you will get about a 4 inch lift.

I see Correct Trac was mentioned. Click Here for a link to the page. It basically is a setup of raised and adjustable shackle hangers.

Thanks all for the responses. I may have to re-evaluate an axle flip.
I really don't want to run the risk of weakening the leaf springs.
Not sure how much room is there to increase the wheel and tire size.
Thanks again for all the replies.

Taller Shackles will only work for a short time , it will increase the spring travel and in short time either flatten the springs , or cause them to break .
( I did it on my 68 mustang in high school , springs lost their arch in 3 months )

Use the sub frame method.
If you noticed axle makers and trailer makers don;t or offer a suspension block in a multi axle trailer nor do they have a option for them.
I had boxed/heavy shackle plates that had adjustable holes added to my previous 5er.

I raised my current 5er by the boxed sub frame method. IMO there was less stress on the hangers and suspension while side scrubbing around corners.

An axle flip is easy. I did mine in about 4 hours, because I wanted it to pull level and stay hooked up for just an overnighter.

i think with shackles you'll only get about 2 inches at best but 2 inches but with larger tires you could get to the 3 inch mark... lift blocks may work like Lowsuv suggested but i don't like them period... you increase the possibility of axle wrap (although that may be more predominate with a drive axle?) that being said most 4x4 trucks have them from the factory so take my opinion for what it's worth. i don't know of a reason that an axle flip would be bad other than it being lifted too high. (my axles are below the leaf springs from the factory) the subframe idea seems pretty good but unless you really trust your wielding skills, you're out of the realm of DYI.... good luck

Most hawe a sub frame added of 3 or 4" rectangular section for suspension.

correct track alignment will lift trailer 2 inches