Congratulations!
However, I would highly suggest that you rethink the plan of full time living in a RV for now.
Marriage is a huge step in life, adding in challenges of RV limitations might not be ideal way to start things out.
I personally would never ever have considered living full time in a RV when I was just newly wedd..
First of all, you are not going to "save" money, get that idea out of your head (which is what most newbee RVs think will happen).
Depending on where you and future DW lands for school, living in a RV in the winter may not be fun at all, in fact can be a chore to down right miserable in freezing and sub zero weather.
Even when not in freezing weather, you will need to be the electric, water and sewer "authority" of your mobile domicile.. With managing the sewer authority hat being a thankless task which will need repeating weekly or so basis.
You will have very limited length showers, no more 25 minute scalding hot showers which pin you to the far back wall of the tub, you and your newly minted bride will be settling for 10 minute showers with not a high volume of water if you conserve.
Second of all, living in a extremely small footprint of a RV you might find to not be very good for a brand newly minted marriage especially if BOTH of you have never spent any time in the size constraints of a RV.
IF there is ANYTHING wrong with your RV, YOU will need to figure out how to fix it, otherwise you will end up losing your RV to a dealer to fix it and it may take them weeks to months to fix.. You WILL have to come up with an alternate plan to live in this case..
If one or both of you are planning to go for further education, you simply are not going to want to deal with fixing or maintaining a RV when something breaks..
Rent an apartment or even a mobilehome in a park already setup, this way you have more space and do not have to deal with the things that can go wrong with a RV while living in it.
For a couple of good laughs, I would suggest looking up the movie called The long, Long trailer.. A classic movie. It is comedy/ adventures of a newly wed couple who buy a trailer to live in.. By the end of it you will get the meaning of "Trailer brakes first" line..
IF you feel you must go down this rabbit hole, I would also echo the idea of buying a used RV, much less money lost if you find that living in a RV is not working out so well.