Underdeck mount boarding ramp for tritoon!

[Wet Dog Waterhole]

i am looking for an underdeck mounted boarding ramp that will fit between my tritoon. Harbor Mate and extreme max make a nice looking product, but they are designed for pontoons and won't fit between my tritoon logs.
Has anyone found a ramp and mounting system that will fit between the left and center toons of a tritoon?

This will be used for an elderly member of the family that has really bad knees.... so has to be rated for up to, I am guessing, around 600 lbs...

 

[Wet Dog Waterhole]

Has anyone found a solution for an underdeck mounted boarding ramp, that will fit between the logs of a tritoon?

 

[cwag911]

This will fit with some modifying.
https://www.pontoonstuff.com/collec...n-boat-ladder-5-step-ladder-for-easy-boarding

 

[Wet Dog Waterhole]

Thanks for the link, that is close, I am hoping to find a ramp for an elderly family member. Might be able to add some decking.