Check out some type of lifts that are used for wheel chairs or carts.  Most I have seen fold pretty flat when you are not using them.  I use my frontend loader on my tractor with a harness I made up with tiedown straps.

One alternative would be to use a non electric start generator. Many of those in the ~2500 watt ranges weigh aprox~70#. I was planning on the purchase of a Yamaha version, and placing it on a sliding shelf on the floor of the rear trailer tack area. There are heavy duty ball bearing drawer slides available, that have 125# capabilities and could support a moveable shelf and generator. It could be slid aft while being used and fueled, and stored under the saddles when not in use. It would be locked and secured whenever the tack is put away. With a temporary placement, it could easily be moved to any other location whenever it is needed.

Of course this is all a moot point, if your infirmities restrict you from manually pull starting a generator. If I had the same requirements as you, I would use the bucket on my tractor to load and unload a 150# generator.

Gard

We purchased a winch from harbor freight and installed it in the ceiling of the garage (with appropriate bracing in the attic to support the weight capacity).  We put it on a rail running the width of the garage so it could slide and be positioned (and locked in place) as necessary.  I can back the truck into the garage, run chains through the handles/frame of the generator (or other heavy things), lift up, pull the truck forward, and set down a variety of heavy items with the flick of a switch. 

I have a Ef3000ISEb Yahama that lives in the pickup bed. I only have one leg so I use my tractor and frontend loader to lift alot of things. You could also use a "come along" or overhead hoist, to lift it out if you park under a garage or building. Or use a come along to lift it underneath the trailer's gooseneck. Attach one end of the "come along" to the gooseneck, other end to the genset, lift the generator and drive the truck from underneath.....

Some folks use a pair of 2000 watt generators wired parrallel....  http://mayberrys.com/camping/index.htm

Says they weigh less than 47#... http://www.hondapowerequipment.com/products/modeldetail.aspx?page=modeldetail&section=P2GG&modelname=EU2000i&modelid=EU2000IAN

Looks to me like you would spend alot of your time refueling and restarting this parrallel setup.... Small fuel tanks.

Just had my first weekend camping with my new Honda EU3000i! That was the most expensive cup of coffee I've ever had, lol.  My original plan was to have it live in the bed of my truck secured with two locks.  One with a cable to one of the front tie downs and with another chain through the GN hitch safty chain eyes.  After getting it into the bed of my truck I realized that set up was not going to work as I couldn't get the generator far enough forward (truck tool box is in the way) to avoid the possibility of crushing it with the trailer in a very tight turn.  Consequently the generator will live in the front stall of my 3 horse slant and just have to be manhandled out for now.  I am planning on mounting it to a furniture dolly I have for easier rolling. 

Wish I had a tractor with a bucket.... 

I also have the  Honda3000 and I set it in the back of the truck near the tailgate and it stays on the truck the whole time I camp running or not. Makes it alot easier for me. I get a friend to help me load it before I hook up.

If you put your generator in the bed of your truck...make sure it is properly secured...so it does not become an unguided missle in event of an accident...

Also, it you operate the generator from the bed of your truck...be careful during your fueling activities of said generator...

Paul, is it the static electricity danger you are referring to when cautioning about refueling in the bed of the truck?  I know you shouldn't refuel gas cans in the bed of the truck for that reason and I guess it makes sense for generators too. Thanks for the words of caution.

Are the remote starters for the Honda generators expensive? 

Before you purchase the generator make sure it is a quiet one or those parked close by won't be happy. As far as the 2000 watt Honda generators having small fuel tanks, that is correct but you can putchase an extended run fuel , 6 gallon , that can be connected to the tanks and give you a much longer run time

Yes, Honda has come out with a new 3000 watt generator that is much lighter in weight than their other 3000 watthas a built in handle and wheels. Also have a new 2000 watt gen.This one has a built in adapter so you simply plug in two wires providing 4000 watts peak , 3200 running. Nope, have no connection with Honda. Only reason I know about this just purchased the extended run tank. Not sure how long the 6 gallon tank will last but will soon

Be careful about the fumes.  Here is a local newspaper clipping from the latest Nascar race in Atlanta.

http://www.barnesville.com/archives/1248-Thomaston-Man-Dies-at-AMS.html

Just a reminder to be careful about a silent killer, make sure your detectors work.

Originally written by mingiz on 2009-09-09 4:23 PM

Thanks for your advice. I do tie it down when enroute. I usually only fill it once in a weekend when it's cold, and it is only in use when I need it. Is it a bad thing to leave it on the truck?  I'm usually alone and it's to dang heavy for me to lift and I have no room in the trailer for it. I figured that would be my easy fix....

We have had our Cummins/Onan P4300 mounted on the back of our hauler bed since we bought it a few months back and so far no issues at all.  We do have a HIGH quailty chain and lock on it.  Too many sticky fingers around here.  Better half works for a motocyle parts dist. and we got a ONGUARD lock and chain.