Wheel wells are checked. I have had 3 rvs none of which where this new. Most from the 70's. I used the portable stands and they worked better than these. Every time my 6 year old rolls over in the rear bunk it shakes the entire camper. I agree I could settle for far less quality than what was made 40 years ago and that would make me typical like everyone else but I'm not into that. I paid 20k and I just cant settle for lack of quality. I purchased some real jacks online (Reese) brand I'll post their results. My new issue is now all the grey and black water lights showbtanks are full but I'm hooked to full hookups is this just poor quality as well and I should just settle for gages that don't work either?