I researched this quite a bit when I bought my Ace. I bought a pair like these. It turned out the Ace was a bit much to haul in my Tacoma. I ended up using the trailer since the weight on the tailgate was too cringeworthy.
Supposedly, the ACE is 48" wide. I found that it measured 47 in the front and 49 in the back when I picked mine up.
But if your wheel humps are more than 48" wide, you'll fit in there without driving over the humps.
The ace can drive right over the humps without any issue. I know you're looking to buy ramps but I love these. I load forward and reverse without issue. I think my truck sits fairly high too. The 8' ramps stay right under the ace during travel.
If you are concerned about weight behind the wheels, load the Ace backwards. That puts the engine in front of the rear wheels, instead of well behind them. My wife loads both the Ace and our Rzr backwards on our truck, plus we use the DG tailgate bars that Scoundrel referenced in his post, as a safety feature.
Harbor Freight steel ramps just fine. Regarding Tacoma, I've placed 2 X 6 from humps to rear gate. Note, do not place Ace in bed of Tacoma's with out protecting rear window especially if you have brush guard or winch on front. I made that mistake This might apply to other trucks as well...
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