Only in the sense that it is more than you can carry, or that you are paying for more than you need.
3.6 KW to 4 KW is enough to give you generator power equivalent to a 30 amp 120V hookup (but you have to be sure that the genset has that connection, as many non-RV generators in that size instead have a pair of 15 amp or 20 amp outputs).
If the full load possible on a 50 amp plug-in is 12 KW, but very few RVs with 50 amp service actually have that much load, and genset sizes are more typically 5.5 KW to 8 KW.
If you have 30 amp service, buying more than 4 KW is usually paying for something you can't fully use.