Lifting the 5er

Sorry but I don't get caught up in all the hype about HAVING to use a subframe to raise an RV just a couple inches...if OP needed 3 or more inches then yes I agree that would be the way to go. People have been using lift blocks for years in trucks with live powered axles...heck your dually and 3/4 ton truck probably has them from the factory that a lot of people overload daily. I've even seen multiple stacked blocks on 4x4s, so with that being said, I'm not afraid of using up to a 2" lift block on a fifth wheel trailer and I'll tow it with confidence anywhere most will tow theirs. Ultimately its up to the OP on what he feels comfortable with and what he is willing/or can pay to be perfectly level. Two to four inches out of level in a 30ft plus camper really isn't anything to stress about in my opinion. They say the shop wouldn't do the work to install lift blocks without a liability sign off...what about the tire shops that won't use LT tires on a trailer that ST tires came on from the factory...obviously some think the tire shops don't know what their talking about and use LT tires anyway so where's the liability there!