Finally got around to the RV a few weeks ago. All ideas were derived from this forum, so thanks all!
Screen door push bar (so simple yet a necessity):
Assist grab handle:
RV Truck box mod (I choose Husky):
Measuring the frame to box:
welding complete:

Curt Mfg hitch receivers:

frame with spray on bed liner:

Frame test fit:

Spare tire fits under here too!

Spare under frame:

Test fitting box (left room for future bike hitch or accessories):

Mounting bolts:

Done!

Finished left side view by
Geo662, on Flickr
Checking ground clearance by
Geo662, on Flickr
finished right side view by
Geo662, on Flickr
Good ground clearance by
Geo662, on Flickr
Curt Mfg hitch receivers by
Geo662, on Flickr
And finally, installed snaps to my PUGz:
Pugz with snaps by
Geo662, on Flickr
The snaps make installation of 3 PUGz "a snap!" OK, lame, but really it only takes 3-5 minutes to install them now (most of my time is spent climbing up and down the bunk ends).
Thanks all for your great ideas, and to 4Happycampers for the truck box advice!
vr, Geo
Moderator edit to remove duplicate pictures and correct formatting.