tim292stro
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With the PLS, Oshkosh put on guides with angled "blind alignment" wings that center the load as it comes into contact with the guide. I'm sure you could put some sort of wing on the bed-box to emulate this.
From some seat-time I had in a Hook and Ladder tiller (no I'm not a Firefighter), there are some optical/physical things you can do to align the truck to the shelter. On the tractor of a ladder trailer, they usually put a lamp-post (white) in the center line of the tractor roof (sometimes this is disguised with an American flag) - the point of the lamp is that while seated in the tiller house looking towards the cab, when you are tracking the tiller-end in line with the tractor that lamp should be centered in the open end of the ladder.
You could do some similar setup on your selter/bed - an inverted stencil "V" in a contrasting color on the top edge of the shelter roof (winch-end), plus a bump of some sort on the door end of the shelter. Couple this with a contrasting line painted in the center of your bed box and two vertical black stripes on your rear cab window. when viewed through the rear view mirror during backing, it would look like this roughly (forgive the quick sketch in paint - tried to keep it somewhat perspective correct):
This would help you back up straight and aligned with the shelter - doesn't use any power or welding either.
From some seat-time I had in a Hook and Ladder tiller (no I'm not a Firefighter), there are some optical/physical things you can do to align the truck to the shelter. On the tractor of a ladder trailer, they usually put a lamp-post (white) in the center line of the tractor roof (sometimes this is disguised with an American flag) - the point of the lamp is that while seated in the tiller house looking towards the cab, when you are tracking the tiller-end in line with the tractor that lamp should be centered in the open end of the ladder.
You could do some similar setup on your selter/bed - an inverted stencil "V" in a contrasting color on the top edge of the shelter roof (winch-end), plus a bump of some sort on the door end of the shelter. Couple this with a contrasting line painted in the center of your bed box and two vertical black stripes on your rear cab window. when viewed through the rear view mirror during backing, it would look like this roughly (forgive the quick sketch in paint - tried to keep it somewhat perspective correct):
This would help you back up straight and aligned with the shelter - doesn't use any power or welding either.