yrusoslo, our new 5th wheel did not have an on-board generator as an option. It didn't have generator prep as an option either. I have always used 2 - 2000 watt Hondas but I really wanted an on-board unit this time so I purchased an Onan LP 3600 watt generator (only size that would fit in our front compartment and enough to run at least 1 of the A/C units) from an online seller and had it installed by a mobile RV technician. I had quotes from 3 dealerships, including the dealership I bought my trailer from, and they all wanted at least $8-9,000 for the generator and installation. My total costs including the additional installation and set up of an inverter to run my entertainment center when we don't have shore power or running the generator, was $5,800. I was able to sell my Hondas for about $1,000 ($2,000 new cost) so my out of pocket was under $5,000. Much better than the quotes from the dealerships and we love the convenience.
Paul "Poppy" Cervone
2016 GMC Summit White Denali 3500HD SRW CC/SB
2015 Grand Design Reflection 337 RLS