Newbies RVers!!!


New Member
Hello Folks!
We are about to buy our first RV and have several questions:
1- What is the ideal length to navigate across the US without problems (including national parks)?
2- Diesel or GAS and why?
3- Are slideouts to be avoided or no known problems?
4- Ford or Mercedes?
5- For the same price, brand new Thor Axis 24.1 2018, or used Forrest SunSeeker 2800 GTS 2018 (2800 Miles) and why?
Thanks a lot for your help and hope to see you soon on he road!!