Keystone Elite 27RB Stablizer Jack Question

[TickTock]

I have an Elite 27RB which is a 31 foot TT. It came with 24 inch stabilizer jacks (marked with a yellow sticker and Model J-2500) and often they are too short to really stabilize the unit as they end up fully extended. I have been using 6x6 blocks to help, but this is proving to be a pain to haul around - especially after a rainy night prior to departure...

I was wondering if these might not be the right size ones since it appears that sometimes when they are building these and are running out of a part they tend to throw whatever is lying around on. If they are the right size, has anyone had experience changing them out to 30 inch ones? If so, what brand worked well? If someone has something factory installed that is different I would be curious to know what they are as well.

Thanks for any information.