[Chas H]

Current distance from holding tank to head is 5 feet. Once relocated it will be approx 14 feet away. Any issues with the additional hose lengths?

Thanks for the feedback.

I wonder if you could install a vacuum pump (S series vacuum pump - Dometic Corp) in the line to the holding tank and still use the same toilet? You might have to disable the manual pump. Minimal water is required to flush. I am familiar with vacu-flush systems having rebuilt a a Dometic Sealand pump recently.
Just a thought, if not a solution.
-CH