I have the standard 9" jacks that came with my camper when I bought it. However, when I went to use them, they're WAY too tall to fit under any part of the camper frame...and that's without a 1 bi block under them. I did use them once under the floor but I sure don't want to keep doing that. Is there a company out there that makes the same ones only shorter? I really don't wanna use scissor jacks but if that's all there is available...and in my area, I don't know anyone that could fabricate shorter bases for me.