Question about my truck build and generator placement

I had a thought and was wondering if this would be possible. I have a 270lb Onan Marquis 7000 and I was looking under the stairs around the wheel well of my Chevy 1998 p30 18ft step van and had the idea of mounting the generator under there to save space.  Do you think it's possible and will it hold all that weight?

I'm not exactly sure of what area your talking about. Stairs...do you mean the steps coming into the front drivers area? If so you have exhaust manifolds and the transmission in that area. I'd doubt that, that would be a good area for a generator. I'd look at the drivers side just behind the drivers seat or for that mater anywhere else on that side of your SV.  You don't want it close to your service window if you can help it.

Ok so you think behind the driver side is better? Also do you think the onan will hold under the truck? I man I see these onan kits for floor mounting but it looks so flimsy, do you know of another ya of mounting it under the truck with it being more sturdy? Thanks

Any good fabricator could build a frame to allow almost anything no mater what the weight using the truck frame and some structural support.
 
I'd strongly suggest a great deal of research here and online as well. There is the original framing, roll-out drawer for service, gas supply propane/gasoline, vibration/noise from both the operation and exhaust, cooling of the generator, and supply lines to electrical power box to be considered. Most of these issues have been discussed here but there are some great articles about how to quiet a generator and other issues on line. Not a quick fix "oh just stick it here" type weekend project.

I have built gen boxes on roofs and mounted them up there, built hanging frames off the frame of the truck and mounted them there, but I gotta say the easiest way is to drop the sucker on the floor somewhere in the truck, cut a hole in the wall, frame the hole, use the existing panel I just cut out and put a vent on it, turn it into the hatch. Build a box around the generator on the inside, done.

belcidbo just build a gen setup check his out.

Thanks so much I hadn't seen your build yet its going to help me so much!

Here's a little better picture: