I haven't camped in either. But there often is a little slack in RV length, more in some cg than others. As long as your unit does not protrude into the roadway you are usually OK. There are no RV length police with tape measures. But the ironclad rule is that if you cannot get into a space you lose your payment for the site and they will not try to find a spot you can get fit into. Of course enforcement varies by ranger temperament at any particular park. Some are great and some are jerks.
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when I stayed at fishing bridge years back, many/most of the spots had a wooden post at the end of the site many/most of them had been backed into
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At Fishing Bridge the sites are end to end, like a giant parking lot. Which is what that CG is. And another RV is backed into the site behind you. So they of course do not want you to intrude into the other guys space. It is a parking lot but it has utilities so people want to camp there no matter what the esthetics are. You would also be very close to the people on each side. FB is closed for renovations this season.
As for water they officially do NOT want you to install hoses and use hose bibs that have no thread on the end for a hose. However there is a way around this:
Water Bandit