So I actually saw the smaller pump in an article about what pump to buy. While they did say most people would use a 3.5, they said that THIS smaller model had great reviews. It is 1.2 GPM 35 PSI.
Now I am NOT going to "live" in the RV. I am sure I will eventually fall in love and buy a bigger RV as seems to be the case. But for right now, I am just feeling it out. Maybe take it to tailgate a football game, or save some money on a hotel room and sleep in a rest stop one night.
I get that "bigger is better" and I do not expect much. I just wanted to make sure it was not a TOTAL noob mistake.
Yes the RV has an old pump.. But it does not seem to be pumping, I did the testing, but it just is trickling out from the output side. It also is old and the new self priming, run dry pumps seem like a better idea. The original pump is for SURE small. Again, this is an old '86 rv that was a Chevy van. It is SMALL and nobody will be showering while running water. It will just ever be me and my son.
I plan on bottled water, paper plates and likely no showering. But probably using the rest room. :) MAYBE once I get into it... a "dry camp" for a day or two. But for $30, I can just upgrade the pump later.
I am sure many of you are WAY more serious... and why I respect your opinions.