I have a Onan gas 6. 5k Emerald commercial ( 1800 rpm )set in the 5th. I opted for the Emerald for several reasons: they do not make the RV Emerald ( 1800 rpm )any more. It has a control panel with doagnostic led's and hour meter on control panel, built in 12vdc 10a battery charge windings & I installed a remote panel in the kitchen.
I carry 6-6gal marine gastanks ( easier to handle than the equivilant 147# of propane ) that fit between the 5th wheel and my aux fuel tank in the bed of the truck and run the fuel line through the landing gear opening to the tanks on the ground or in the bed.
Last fall while deer and elk hunting ( wives were hunting too ) we boondocked for 5 weeks at about 8k ft, temps were 20-50 day and 0-20's at night The gen was run for about 1/2hr in am to recharge the batteries and a couple hrs at night ( satelite tv ) to fully charge the batteries before shutting it down for the night. We were 3 hrs from the nearest town, 4. 5 hrs from propane. We procured water ( 2- 15 gal drums ) about . 5 hr away every 4 or 5 days. We only made one trip to town, the 4th week and did not have to get gas or propane. If we had a propane gen we would have had to fill propane tanks at least once.
Black tank was about full, propane was about expended, and had 1 tank of gas left.
Everything was great
Now for the 2 solar powered units that were with us:{ :{
It was overcast for all but 3 days. Snowed the last 2 weeks and rained the first 2. 5 weeks. We had extension cords run to the the other trailers to recharge their batteries. They never achieved full charge because of the limited gen time. Thier tv time was determined by my gen. They could not watch tv or use any 12v acessories except miminal lighting. On a couple of occasions one of them would try to fully charge his two 8D batteries ( she wanted to watch some tv )with jumper cables to his Cummins diesel for about 4 or 5 hrs and still could not top off batteries.
My gen cost about 30% more than their 4 big solar panels, inverters, charger +++++..... that only gave a few days full use of trailer and acessories.
It was everyones first extended boondocking and some very big important electrical systems lessons were learned. 1 furnaces use a lot of power. 2 tv's eat power. 3 when batteries go dead or ( below 11. 2vdc ) the furnaces will shut down and the other halfs get irritated at 2am when they wake up and have to get the sleeping bags out and try to heat by stove in the dark.
Runing the ac while making a short sleep stop in a rest area or Walmart is also convient
JM $. 02 worth for free