First thing is call the power company and see if they accept grid tied and how they handle it. Most importantly what fees and rates do they charge people with solar. It may decades to recover the cost of hooking it up with as little power that you will be producing.
I also think that you will find they want a permanent installation and will not be interested in panels on a RV.
Another way of doing it would be to plug a extension cord into your RV inverter and run things in your house. I could set my 750w system up here at the house and run my fridge off of it. That would put a dent in our power bill. Unfortunately it would also be cycling my battery bank daily and I would have to save enough on bill to replace them faster than usual.
So check into it and see if it feasible. Solar on a RV is wonderful and worth every penny just to not listen to a generator. Grid tied can be complicated and expensive.