Some of the lite units are just as well built as "normal" units and may even cost more due to the construction methods used. My old '01 Trail-lite fifth wheel used fully laminated walls, roof and floor and this construction method determined the wall strength, not the quantity or thickness of studs in the wall. But I've also seen lite units with wood studs just 3/4" thick. So, it pays to do a lot of homework.
Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'11 Crossroads Cruiser 32MK loaded