Dolphindani, It all depends on how determined you are. I live in a motorhome. I'm not disabled or mobility impaired but I stay in a lot of military RV parks, and I see many people who are, traveling and living in their RVs. It does not deter them one bit. There is no reason why you can't do this. Even if you are in a wheel chair you can get a lift like they have on buses to lift you into it.
A boat would be a little more difficult. But boats have been modified to accomodate people in wheel chairs so why not you? As was said, they move around a lot, so handholds and non skid surfaces are a must. High railings are a definite must too. But there is no reason it can't be done with a little determination and help from your friends.
Just an inspirational story. About ten years ago a blind person sailed his boat from the US to Africa with no one else on board. He used modern navigation aids that had voice and collision avoidance alarms on his radar and was tracked 24/7 by the US Coast Guard by satellite, but he did it.
So as I said it depends only on how determined you are.
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