is the main problem that bottom step and how far above the ground it sits? Some folks regularly use a sturdy metal step stool to sort of fill in that area...makes one more step, but not so far to the ground. Our HTT had 2 steps, I believe, and our DS managed those just fine because they were closer together. The TT has 3 steps and they're further apart....plays havoc with his legs. We try to get him either inside for a while or outside rather than frequent trips up and down. If you don't find something ready made to work, possibly a metal fabricating shop or mobility store could help. Good luck.