Is there any other place on a 1987 HiLo FunChaser besides the MISSING PLACQUARD outside the door where I can find the ID/Serial Number?

Check the tongue underneath, some people have found them under there, newer trailers are stamped on top of the tongue.

On one of the other posts, someone said they found it on the tongue underneath the propane tank mount.

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas

Mine is on a little aluminum 'sticker' on the left side of the tongue. The propane tank holder on my FunChaser is welded on, I doubt if there's a number under there.

we are the ones that found it under the propane tank mount. Although I think that mount must have been moved because the battery is outside. Where it is on the tongue is curb side rail (top) about 22" from where the center of the ball would go on the hitch. Ours was so pitted that the inspector OKed it but would not register till we get another vin tag mounted from the state (OH). Ohboy another couple weeks till we can camp. Hope yours is in better shape Peggy