They do have a lot of flex to them, even when installed as recommended and I was also worried about that. I went to my local metal place and had them cut some 2" aluminum channel to go between the trailer bunk supports. I countersunk and through-bolted them to the bottom of the boards the same way I mounted the boards. The aluminum channel was $2 a ft. The factory installed supports would have added $9 a ft to the price of the boards. $7 a ft was a significant savings and I'll never deal with bunks again. That said, I plan on keeping my rig for a long time and I launch and load 3-4 times a week by myself, so anything helps.
Edited by Bob Landry (10/06/16 12:48 PM)
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner